I just came across an interesting website which calls itself オノマトペ辞典 and I thought it may be of interest.
You can search by あいうえお order or by category (or using the search box). It’s all in Japanese so probably more of a resource for intermediate+ learners. It’s probably not exhaustive, but as a visual learner, I love how it illustrates the sounds. This is a screenshot from the homepage.
This is a pretty extensive source. The pictures and the definitions surely help to understand the abstract nature of onomatopoeic words in Japanese.
Wow looks interesting! Bookmarking this for further reference!! Denks much 
Great! I’ll check it out for sure!
Hah, pretty. I’ve just been using this…