Top 5 xtensa open source projects

Esp Open Sdk
Free and open (as much as possible) integrated SDK for ESP8266/ESP8285 chips
interp
Interpreter experiment. Testing dispatch methods: Switching, Direct/Indirect Threaded Code, Tail-Calls and Inlining
ida-xtensa2
IDAPython plugin for Tensilica Xtensa (as seen in ESP8266), version 2
1-5 of 5 xtensa projects