Yesterday I opensourced my chatting application I have been developing on and off since late 2021: https://github.com/aolo2/chat

It features a fully custom websocket server built in C using io_uring, and a custom on-disk database (if you can call it that).

There's also a media upload server which is also written from scratch in C on io_uring.

The client is a web UI, which I built in js with no libraries. Here's me scrolling back in time by holding PageUp and searching in a channel with about 10K messages

I have made an online collaborative whiteboard over the weekend. Come check it out!
Powered by Bun.sh (which is written in Zig). It's about 2KLOC backend + frontend (I'm not using any js packages)
https://desk.some.website/desk/777

edit: forgot to link the code!
here it is: https://git.some.website/aolo2/desk2