AbendInfo Arduino ESP8266 library - Improve Postmortem reporting by intercepting some crash events that result in Hardware or Software WDT Resets. And, cache the results across reboot.

BacktraceLog An Arduino ESP8266 library that generates and stores a backtrace of a crash in an IRAM or DRAM log buffer. By crunching the stack trace and code to create a list of function addresses at play when the crash occurred, we can condense the amount of data that needs to be stored for later analysis. Reducing the data to a small list allows storage in slivers of unused IRAM or noinit DRAM, which can optionally be backed up to User RTC memory.

MAX31855K Arduino ESP8266 Device Library for the MAX31855K with the option to apply linear corrections to non-linear thermocouple response. The Troubleshooting section has some insight into issues that can occur with the ESP8266 and SPI devices.

SpiFlashUtils An Arduino ESP8266 library that supports reclaiming the use of GPIO pins 9 and 10 on ESP8266 modules that expose access to those pins. The build requires SPI Flash Mode "DIO" or "DOUT". A Review of Past Attempts

JedecJep106Lib SPI Flash Bank/MFG ID Lookup. Provides a wrapper to use flash manufacturer name look-up library from tianocore/edk2 from an Arduino Sketch.