めんそーれ
Bit of hasty Googling turned up these pages, which seem a pretty good place to start.
For Okinawan:
http://yado-umino.sakura.ne.jp/page168.html
https://www.gyokusendo.co.jp/dialect/
For Osakan:
大阪弁 - Wikipedia
Kansai-ben: 2. Kansai Grammar Index (is Kansai-ben in general, but it works fairly well for Osaka-ben)
(I did a translation of a drama series in which half the characters spoke in Hiroshima-ben, and the other half in Osaka-ben, and that was certainly entertaining. ほうじゃけ～, すまへん and so forth.)