Over the years I’ve filled my Warframe bookmark folder with various useful websites, maybe you don’t know some of them and hopefully you find them useful! Do let me know if I’m missing any and if you want me to add it to the list.

Honorary mention to the one and only Warframe Wiki 🎉

Dashboards
Tenno Tools - timers, cycles, limited time events
Warframe Hub - various timers but also much more (good resource for open worlds, synthesis targets, etc)

Trading
Warframe Market - no introduction needed I hope, this is the place to go if you wanna trade
Riven Market - riven trading

Builds
Overframe - find popular and meta builds
Semlar amp builder - also zaws and kiguns but check the rest of the site for other useful tools too

Relics
Warframe Squads - LFG tool for relic sharing
Warframe Reliquary - fissure tracking tool
Tenno Zone - (now outdated) tool to plan out your prime hunting and relic farming adventures

Guides
Synthesis Target Locations - where to find easiest/guaranteed synthesis targets
The Ultimate Fortuna Guide - it seems the site isn’t updated anymore but you could still find some good intel there

Misc
Shawzin Documentation - everything you wanted to know about the shawzin, and more
Compozin’
Mmmm glyphs
Mandachord Songs - probably the biggest song list you can find, have fun Octavia mains