MemberPrism - open source alternative to memberstack / memberspace , but with both front and backend member-only content protection - easychen/MemberPrism2
fangr.am - Building communities for creators
Crowdstack Pro - Engage, retain, and grow your community
FansMine - Subscription social platform for creators & their fans
Geneva - An all-in-one communication app for groups & communities
Patreon - Patreon enables fans to give ongoing support to their favorite creators.