On topic, collaborative docs with end to end encryption https://cryptpad.fr/ https://cryptpad.fr/ I use the Kanban app, it's so snappy. In comparison Trello is

On topic, collaborative docs with end to end encryption https://cryptpad.fr/ https://cryptpad.fr/ I use the Kanban app, it's so snappy. In comparison Trello is a bloated PoS. Also on topic, the XMPP protocl is federated and supports E2E encryption via OMEMO aka "the signal protocol". Go create an account and get your friends into it. I use Dino on Debian and Conversations on Android. These two clients support all the "modern" features that whatsapp does, including audo and video calls, in addition to niceties like public channels where you can meet new people outside your circle of friends. For providers, find one on https://providers.xmpp.net/ https://providers.xmpp.net/. All of this is free software, (although in the case of XMPP being federated you can't guarantee that your messages won't be routed through proprietary servers.) Not affiliated with either, I just LOVE those two.