If you're interested in gardening or ecology, the entire Solarpunk instance (slrpnk.net) is full of great munis for you. Here's all of those plus some from other instances.

!farming@slrpnk.net

!diy@slrpnk.net

!zerowaste@slrpnk.net

!composting@slrpnk.net

!reclamation@slrpnk.net

!cdr@slrpnk.net

!animal_husbandry@slrpnk.net

!soilscience@slrpnk.net

!diy@beehaw.org

!greenspace@beehaw.org

!righttorepair@midwest.social

!right2repair@discuss.tchncs.de