Here are some public and semi-public stuff I run from my servers. I host my stuff from two servers. One named NL1 in the Netherlands and one named PL1 in Poland. Some require trust to get an account, some are open, and others are on a case-by-case basis.
A privacy-friendly VOIP. No accounts needed, low latency, works even on potato (Polish) connections.
And pretty decent modern IRC bouncer. Only people I know quite a lot and who trust me, and I am them get an account.
Web IRC client for the Soju IRC bouncer I host.
A federated chat protocol better than Discord IMO. Accounts available only to trusted friends. Until I get a second domain.
A bridge written in java (Not my software) that links Discord chats to IRC channels — request access if needed. (Supports webhooks)
PrivateBin is a minimalist, online pastebin where the server has zero knowledge of stored data.
An unofficial Bitwarden compatible server written in Rust