Cron - Cron Calendar.
Solid - Solid is a solution for online business meetings.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Lander - Lander is a powerful online tool to create Landing Pages.