I created Synclinear.com in a weekend while working at Spacedrive.com. Cal.com discovered my project and started using it, while using it they had some requests which I was not able to fulfill as it would require a frontend to work, sadly I am not able to create a frontend from scratch. Cal.com then took over the project and maintain it nowadays with Neat.run.

Synclinear.com is now being used by companies such as Cal.com, posthog.com, Amie, livepeer, novu, and last but not least Vercel.