Not vouching for the quality of any of these, especially the last few ones:
https://www.reddit.com/r/conseiljuridique/
https://www.reddit.com/r/france/
https://www.reddit.com/r/vosfinances/
https://www.reddit.com/r/jardin/
https://www.reddit.com/r/cuisine/
https://www.reddit.com/r/AskFrance/
https://www.reddit.com/r/suisjeletroudeballe/
https://www.reddit.com/r/rance/

You can find a list here: https://www.reddit.com/r/france/wiki/annuaire/