I recently found out about Tukan Studios free plugins for Reaper. I'm writing this just to spread the word. There are perhaps other Reaper users who have missed his work.
The suite of plugins has beautiful graphics and is updated/maintained all the time. It contains emulations of well-known hardware units such as compressors and reverbs, and other mix plugins such as tape emulation, delay, summing etc.
All his plugins have MCP support, so you can watch/control the plug directly from the insert slot. Personally, I use his VU meter embedded in my mixer a lot.
The developer is also open and welcoming of bug reports, suggestions etc.
I will definitely donate.
If you haven't already, you can check out Tukan plugins here:
https://www.patreon.com/tukanstudios