CRSF for Arduino is now available in the Arduino Library Manager and PlatformIO Registry

[ZZ-Cat]

That's right!
You can now download and install CRSF for Arduino in your projects in both the Arduino IDE and PlatformIO.

Arduino Library Manager

In the Library Manager, search up CRSFforArduino and its the first package you see.

Click INSTALL and Arduino IDE will download it for you.
Once that is done, you go to Sketch ► Include Library ► CRSFforArduino under Contributed Libraries

And it will automatically #include <CRSFforArduino.hpp> at the top of your sketch.

PlatformIO Registry

After spotting an unofficial version of CRSF for Arduino on the PlatformIO Registry, I claimed ownership of that version and it is now official.
The link to CFA's official Registry entry is here: https://registry.platformio.org/libraries/zz-cat/CRSFforArduino

All instructions in CFA's Registry is correct as of 2025-12-11 NZDT, and the installation instructions for use with PlatformIO can be viewed here.