as a fellow bootstrapped founder, hats off to the NeetoCal team
I'm personally using Cal.com, it's free and I'm very happy. I'm also very biased because we interviewed the co-founder/co-ceo [1] and Cal.com uses our platform to reward its open source contributors [2]
what I love most about Cal is how young developers from around the world learn modern tech by contributing (and getting trained by the team) [3], support is crazy good [4] and the company builds in public, even their salaries and metrics are open [5]. I cannot not be a fan honestly
[1] https://youtu.be/gymNEH-skAY
[3] https://github.com/calcom/cal.com/pulls