I use Yarnpond for organizing pre-release testing of my patterns. Test knitting calls come out on Bluesky and Instagram as well.

I offer testers long testing periods, typically 3-4 months, to allow for life to happen and also to make sure plus-size testers have enough time to complete. Testers that finish test knitting and provide post-testing information get one free pattern of their choice from my portfolio, plus of course the released revision of the pattern they tested.

I can rarely offer yarn support, but I'm open to collaboration.