Jami, a p2p zoom replacement I am looking to use.

Klipper, for 3d printing. Most of current manufacturer use it as primary software for their printers.

I switched to niri about a year ago. It's perfect for those who like tiling WMs but want a more natural flow, without constant window resizing.

Niri with waybar, fuzzel, and tessen give a pretty complete desktop.

I'll take a slight tangent to this topic and talk about FOSS software I've recently had to give up that I really really miss: Autokey. Autokey is a rough equivalent to AutoHotKey on Windows, it can do anything from on the fly text replacement (type teh and it will correct to the, or type *date and it fills in today's date) right up to firing whole Python scripts. it doesn't work on Wayland (apparently there are security features that prevent it from working the same way it does on X11?), and I've yet to find a replacement for it that does.

NetBird- tail scale but fully open source with web hi, built in or bring your own auth, clients for pretty much everything, and really powerful network separation and segregation functions, along with posture checks and tons more.

I picked up KdenLive for video editing and it's pretty freaking good imo