Open Collective: transparent fundraising tool for organizations
Loomio (or on GitHub)

Loomio is decision-making software and web service designed to assist groups with collaborative, consensus-focused decision-making processes. It is a free software web application, where users can initiate discussions and put up proposals
Signal → organize clubs, teams, affinity groups (no larger community feature like WhatsApp yet, sadly)
- Disappearing messages for activist safety
- Safety number check for journalist & activist safety
Kan.bn - open source version of Trello, sharable boards for tracking
BookStack is a simple, self-hosted, easy-to-use platform for organising and storing information.
Cal.com → a scheduler for booking meetings connected to your calendar. Free, open source, self hostable.
GoToSocial → self-hosted federated¹ social media
Mastodon → federated¹ social media
Wallabag → Save articles to read later — focused and distraction free. Add notes and highlights. Organize with tags and sync across devices.
Matrix
Hylo
Known → A collaborative social publishing engine

Known allows any number of users to post to a shared site with blog posts, status updates, photographs, and more.
Flowershow.app → Create websites from simple text files formatted with Markdown

Dream software tools

open source version of lu.ma
Meeting agenda compiler: how to store shared docs with easy access (dashboard/portal) that is not G00gle-owned.

Dashboard / portal for communities