I did some work scraping discourse to find the posts for scripts. Along the way I ranked them by most likes. Take a look!
035♥, [Userscript] Lesson/Review Count in Forums, https://greasyfork.org/en/scripts/27969-wanikani-forums-lesson-review-status, rfindley
025♥, The New And Improved List Of API and Third Party Apps, https://greasyfork.org/en/scripts/4749-wanikani-review-wrong-info-click, ShotgunLagoon
022♥, [Userscript] WaniKani Pitch Info, https://greasyfork.org/en/scripts/31070-wanikani-pitch-info, Invertex
018♥, Dashboard Userscript: Leech, Apprentice, and Guru detail (aka SRS level progress), https://greasyfork.org/en/scripts/32344-wanikani-srs-level-progress, hitechbunny
016♥, [Userscript] Wanikani Mistake Delay (new, version 2.x), https://greasyfork.org/en/scripts/34235-wanikani-mistake-delay, rfindley
015♥, [Userscript] Self-Study - Quiz Edition with Listening Quiz, https://greasyfork.org/en/scripts/19555-wanikani-self-study-quiz-edition, rfindley
014♥, Wanikani Reorder Ultimate, https://greasyfork.org/en/scripts/19088-wanikani-reorder-ultimate-2?version=225274, xMunch
014♥, [Userscript]: WaniKani Ultimate Timeline, https://greasyfork.org/en/scripts/13475-wanikani-ultimate-timeline, rfindley
011♥, Leech training script, https://greasyfork.org/en/scripts/35031-wanikani-leech-trainer, hitechbunny
009♥, [Userscript] WaniKani Show Specific SRS Level in Reviews, https://greasyfork.org/en/scripts/33260-wanikani-show-specific-srs-level-in-reviews, seanblue
009♥, [Userscript] WaniKani Lesson Filter, https://greasyfork.org/en/scripts/31659-wanikani-lesson-filter, seanblue
008♥, Userscript: Dashboard Level Progress Detail (srs stages on progress bars), https://greasyfork.org/en/scripts/34866-wanikani-dashboard-level-progress-detail/code, hitechbunny
008♥, New User Script: Common Vocabulary Indicator, https://greasyfork.org/en/scripts/33129-wanikani-common-vocab-indicator, dtwigs
007♥, [Userscript] Dashboard Progress Plus, https://greasyfork.org/en/scripts/9552-wanikani-dashboard-progress-plus, rfindley
005♥, [Userscript] WaniKani Review Asc/Desc SRS Order, https://greasyfork.org/en/scripts/23503-wanikani-review-asc-desc-srs-order-radical-kanji-vocab, Mempo
005♥, [Userscript] WaniKani Lesson User Synonyms v2, https://greasyfork.org/en/scripts/34839-wanikani-lesson-user-synonyms-2, irrelephant
004♥, [Userscript] WK Real Numbers, https://greasyfork.org/en/scripts/11244-wanikani-real-numbers, Mempo
004♥, [UserScript] WK Forums: Hide Users' Posts, https://greasyfork.org/en/scripts/28590-wk-forums-hide-users-posts, DaisukeJigen
004♥, [Userscript] Wanikani Override ("ignore answer button") [active support], https://greasyfork.org/en/scripts/9867-wanikani-override, Mempo
004♥, [Userscript] WaniKani Katakana Madness, https://greasyfork.org/en/scripts/26481-wanikani-katakana-madness, Luke-Filewalker
004♥, [UserScript] SRS Grid Details, https://greasyfork.org/en/scripts/22557-wanikani-srs-grid, DaisukeJigen
004♥, [Userscript] For the goddess!, https://greasyfork.org/en/scripts/31555-for-the-goddess, ccookf
004♥, A fix for the Dashboard's "Next Day" lies!, https://greasyfork.org/en/scripts/29584-wk-fix-next-day, tenderwaffles
003♥, WaniKani SRS Reorder Button, https://greasyfork.org/pl/scripts/29673-wanikani-srs-reorder-button, Towe
003♥, WaniKani Denial Mode, https://greasyfork.org/en/scripts/9388-wanikani-denial-mode, nibarius
003♥, [UserScript] WaniKani Double Check, https://greasyfork.org/en/scripts/35063-wanikani-double-check, Ethan
003♥, [UserScript] Stroke animation for reviews and lessons, https://greasyfork.org/en/scripts/12034-wanikani-nippongrammar-extension, Ethan
003♥, [Userscript] Show Review SRS Level, https://greasyfork.org/en/scripts/31571-wk-show-review-srs-level, ccookf
003♥, [Userscript] Satori Reader WaniKani Lookup, https://greasyfork.org/en/scripts/33762-satori-reader-wanikani-lookup, stevie92
003♥, [Userscript] Burn Reviews (ver 2.2.4), https://greasyfork.org/en/scripts/20169-wanikani-burn-reviews, jonnydark
002♥, [Userscript] WaniKani Review Audio Tweak (reupload/fixed), https://greasyfork.org/en/scripts/10184-wanikani-review-audio-tweak, seanblue
002♥, [Userscript] TAB Key to Info click, https://greasyfork.org/en/scripts/31455-wanikani-tab-key-to-info-click, elmeunick9
002♥, [Userscript] Prevent "Your answer was a bit off" answers from being accepted a.k.a. "Close But No Cigar", https://greasyfork.org/en/scripts/7478-wk-but-no-cigar, Ethan
002♥, [Userscript] Item Marker, https://greasyfork.org/en/scripts/18582-wanikani-item-marker, irx11
002♥, [Userscript] Community Mnemonics (v0.9.7.8), https://greasyfork.org/en/scripts/7954-wk-community-mnemonics, Samuel-H
002♥, [Userscript] Burn Manager (Review / Resurrect / Retire), https://greasyfork.org/en/scripts/18822-wanikani-burn-manager, rfindley
002♥, [userscript]: Additional resource links + Stroke Order, https://greasyfork.org/en/scripts/13888-wanikani-additional-resource-links-stroke-order, hoovard
002♥, [Script] Item Info AutoExpander, https://greasyfork.org/en/scripts/4749-wanikani-review-wrong-info-click, mvi
002♥, New version of KunOn script: WK Custom Review Question (KunOn+), https://greasyfork.org/en/scripts/8193-wk-custom-review-question-kunon, hoovard
001♥, WK Reviews: The Final Countdown (userscript), https://greasyfork.org/en/scripts/16442-wanikani-review-countdown-timer, GangsterOfBoats
001♥, WK Fake Numbers (userscript), https://greasyfork.org/en/scripts/7856-wanikani-fake-numbers, nibarius
001♥, WaniKani Lesson Balance script, https://greasyfork.org/en/scripts/34858-wanikani-lesson-balance, hitechbunny
001♥, [Userscript] Wanikani Review SRS/Level Indicator, https://greasyfork.org/en/scripts/15582-wanikani-review-srs-indicator, Mempo
001♥, [UserScript] WaniKani Quick Info, https://greasyfork.org/en/scripts/9814-wanikani-quick-info, Ethan
001♥, [Userscript] Wanikani Procrastination Annihilation, https://greasyfork.org/en/scripts/14972-wanikani-procrastination-annihilation, Mempo
001♥, [UserScript] WaniKani Lightning Mode, https://greasyfork.org/en/scripts/12853-wanikani-lightning-mode, rfindley
001♥, [Userscript] Vocabulary for Dashboard Panel 1.1.5, https://greasyfork.org/en/scripts/27038-vocabulary-for-wanikani, Eekone
001♥, [Userscript] Self Quiz Orientated Lessons, https://greasyfork.org/en/scripts/31747-self-q-o-l, ccookf
001♥, [UserScript] Script that fixes Wanikani shake bug, https://greasyfork.org/en/scripts/30057-wanikani-shaking-for-no-reason-bug-fix, bertoncelj1
001♥, [Userscript] "I don't know" button, https://greasyfork.org/en/scripts/7576-wanikani-i-don-t-know-button, nibarius
001♥, [Userscript]: Hide Context Sentence Translation, https://greasyfork.org/en/scripts/14844-wanikani-hide-context-sentence, rfindley
001♥, [Userscript]: Golden Burn, https://greasyfork.org/en/scripts/15781-wanikani-golden-burn, rfindley
001♥, [Userscript] Auto-WrapUp, https://greasyfork.org/en/scripts/31784-auto-wrapup, zdennis
001♥, User script list, https://greasyfork.org/en/scripts/11244-wanikani-real-numbers, Mempo
001♥, Script idea: leech-o-meter?, https://greasyfork.org/en/scripts/33237-leech-o-meter, hitechbunny
001♥, [Old version][Userscript] Burn Reviews (v1.0.0.3), https://greasyfork.org/en/scripts/7007-wanikani-burn-reviews, Samuel-H
001♥, Homophone explorer, https://greasyfork.org/en/scripts/20150-homophone-explorer, Thaos
000♥, "You should already know this reading" WTF lesson?!, https://greasyfork.org/en/scripts/25128-wanikani-you-should-already-know-this-reading, Mempo
000♥, WaniKanify for Firefox, https://greasyfork.org/en/scripts/5164-wanikanify-vocabularizer, looki
000♥, Wanikani level duration - not working?, https://greasyfork.org/en/scripts/235-wanikani-level-duration/code, Gossepojk
000♥, WaniKani Audio Button Sizer, https://greasyfork.org/en/scripts/9702-wanikani-audio-button-sizer, teeth7
000♥, [Userscript/Userstyle] WaniKani Level Vocabulary Grid, https://greasyfork.org/en/scripts/21628-wanikani-level-vocabulary-grid, normful
000♥, [userscript] WK Lesson Spoiler Tags, https://greasyfork.org/en/scripts/27125-wk-lesson-spoiler-tags, karstux
000♥, [Userscript] WaniKani Wrong Answer Delay, https://greasyfork.org/en/scripts/26216-wanikani-wrong-answer-delay, bertoncelj1
000♥, [Userscript] Wanikani Wrap-up Button Enhancement, https://greasyfork.org/en/scripts/24928-wanikani-wrap-up-button-enhancement, Mempo
000♥, [UserScript] Wanikani Self-Study Plus (v 0.1.13) [Unsupported] (for now), https://greasyfork.org/en/scripts/5899-wanikani-self-study-plus, Ethan
000♥, [Userscript] WaniKani Review Feedback Sounds, https://greasyfork.org/en/scripts/16230-wanikani-sounds, Jexah
000♥, [UserScript] WaniKani Notify, https://greasyfork.org/en/scripts/23453-wanikani-notify, DaisukeJigen
000♥, [Userscript] Wanikani Note Attention Grabber, https://greasyfork.org/en/scripts/26736-wanikani-note-attention-grabber, Mempo
000♥, [UserScript] WaniKani Never Wrong*, https://greasyfork.org/en/scripts/9224-wk-never-wrong, Ethan
000♥, [Userscript] Wanikani Multiple Answer Input, https://greasyfork.org/en/scripts/25102-wanikani-multiple-answer-input, Mempo
000♥, [Userscript] Wanikani Lesson Tab Transmutation, https://greasyfork.org/en/scripts/17050-wanikani-lesson-tab-transmutation, Mempo
000♥, [Userscript] Wanikani Lesson Spoiler Removal, https://greasyfork.org/en/scripts/23485-wanikani-lesson-spoiler-removal, Mempo
000♥, [Userscript] WaniKani Lesson Overlearning, https://greasyfork.org/en/scripts/22459-wanikani-lesson-overlearning, normful
000♥, [UserScript] WaniKani Left Right, https://greasyfork.org/en/scripts/22722-wanikani-left-and-right, DaisukeJigen
000♥, [Userscript] Wanikani Kana Review, https://greasyfork.org/en/scripts/24262-wanikani-kana-review, Mempo
000♥, [Userscript] WaniKani Just The Vocab (Skip Radicals and Kanji), https://greasyfork.org/en/scripts/24615-wanikani-just-the-vocab-skip-radicals-and-kanji, forgottenmems
000♥, [Userscript] Wanikani Dashboard Active Topics Panel, https://greasyfork.org/en/scripts/15028-wanikani-dashboard-active-topics-panel, Mempo
000♥, [Userscript] Wanikani Customize Wrap Up, https://greasyfork.org/en/scripts/24931-wanikani-customize-wrap-up, alsanchez
000♥, [Userscript] Wanikani Anki Mode, https://greasyfork.org/en/scripts/9747-wk-anki-mode, oregu
000♥, [Userscript] Wanikani Anki Mode [active support], https://greasyfork.org/en/scripts/15950-wanikani-anki-mode, Mempo
000♥, [Userscript] WaniKani ALC - Add Link to ALC Usage Examples on Vocab Pages, https://greasyfork.org/en/scripts/6051-wanikani-alc, BreadstickNinja
000♥, [Userscript] Speech Recognition Experiment, https://greasyfork.org/en/scripts/12431-wk-voice-recognition-experiment, Ethan
000♥, [Userscript] Renbow hacks (level-up alert), https://greasyfork.org/en/scripts/16539-renbow-h4x, horusscope
000♥, [UserScript] Progress Colour Change, https://greasyfork.org/en/scripts/20637-wanikani-progress-colours, frugal
000♥, [Userscript]: Markdown Notes (updated), https://greasyfork.org/en/scripts/15778-wanikani-markdown-notes, rfindley
000♥, [Userscript] Lessons touchpad swipe navigation, https://greasyfork.org/en/scripts/24424-lessons-touchpad-swipe-navigation, mrowqa
000♥, [Userscript] Lattice Extension, https://greasyfork.org/en/scripts/18636-wanikani-lattice-extension, irx11
000♥, [Userscript] Kaniwani Anki Mode, https://greasyfork.org/en/scripts/17835-kw-anki-mode, Mempo
000♥, [UserScript] Info page tweaks, https://greasyfork.org/en/scripts/26164-wanikani-info-page-tweaks, DaisukeJigen
000♥, [UserScript] Friendly font sizes for tablets in landscape orientation, https://greasyfork.org/en/scripts/9304-wanikani-landscape-friendly, Ghabry
000♥, [Userscript] Forum Bar, https://greasyfork.org/en/scripts/22785-wanikani-forum-bar, rfindley
000♥, [UserScript] Fade in Down wrong answers, https://greasyfork.org/en/scripts/9278-wk-fiddlesettings, Ethan
000♥, [UserScript] Do You Even Kana? Okurigana Matcher, https://greasyfork.org/en/scripts/9826-wk-do-you-even-kana, Ethan
000♥, [UserScript] Condensed Progress Bars, https://greasyfork.org/en/scripts/22648-wanikani-condensed-progress-bars, DaisukeJigen
000♥, [Userscript]: "Chat Posts" Search Results - Direct Link, https://greasyfork.org/en/scripts/13744-wanikani-post-search-direct-link, rfindley
000♥, [Userscript] auto-commit; the end of the enter key, https://greasyfork.org/en/scripts/16466-wk-auto-commit, johmik
000♥, [Userscript] Accept vocab readings as a correct meanings, https://greasyfork.org/en/scripts/25655-wk-vocab-as-reading, wilddamon
000♥, [Solved] Trying to create a userscript to show context sentences (not included in "currentItem"), https://greasyfork.org/en/scripts/26868-wk-context-sentences/code, nelemnaru
000♥, [Script] WaniKani Links, https://greasyfork.org/en/scripts/24370-wanikani-links, DaisukeJigen
000♥, Review count analysis, https://greasyfork.org/en/scripts/12018-wanikani-review-count-analysis, hoovard
000♥, [Request Granted as Userscript] Auto-show context sentence when answered right, https://greasyfork.org/en/scripts/4749-wanikani-review-wrong-info-click, polv
000♥, Purple Wanikani, https://greasyfork.org/en/scripts/15031-purple-wanikani, ffao
000♥, Language Connection Fridge Magnet Poetry. (Based on a Koichi learning tip), https://greasyfork.org/en/scripts/11137-wk-language-point-connector-cards, hoovard
000♥, Lang-8 "All Corrections" View Enhancer, https://greasyfork.org/en/scripts/11160-lang-8-all-corrections-view-enhancer, Kaimera
000♥, J-Sound: reading keyboard shortcut in vocab pages, https://greasyfork.org/en/scripts/18388-j-sound, Nuke
000♥, Better contrast for colourblindness. Colour change script, https://greasyfork.org/en/scripts/10491-customlevelcolours, hoovard
000♥, Auto-play WaniKani audio on (correct) review, https://greasyfork.org/en/scripts/10184-wanikani-review-audio-tweak, holyone2