About OpenWF
https://about.openwf.io/
OpenWF is a community project to play Warframe offline, specifically for preservation and customization.
Warframe Mandascore
https://buff0000n.github.io/mandascore/
This is an app for viewing and editing Mandachord songs.
The main motivation was to provide a way to be able to copy my songs into the game without having to pause a video. But while I was at it I went ahead and made it a full blown editor.
Amp Builder - Semlar.com
https://semlar.com/ampcalc/747
I made myself a nice amp chart : r/Warframe
https://www.reddit.com/r/Warframe/comments/16e3mbm/i_made_myself_a_nice_amp_chart/