XMPP
Encrypted real-time messaging
Open XMPPPlans
The software behind this service is free and open-source. Paid tiers cover VPS hosting, bandwidth, storage, and maintenance costs. Social media and GitLab stay free; supporter tiers are optional.
About XMPP
XMPP is an open, encrypted messaging protocol that's been around since 1999. It's the foundation of Jabber — like WhatsApp, but decentralized and private.
XMPP is free for normal use with 100GB/week of data transfer. Supporters get 1TB/week. Natalie and Darren have unlimited operator access because they run the VPS.