Cal.com
cal.com
Open-source scheduling links you can run on your own server
Free tier
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calendly.com
Send a link and let people book a slot your calendar says is free.
Calendly reads your connected calendar, offers only genuinely free slots in the visitor's own time zone, and writes the booking back with a video link attached. It removes the three-email negotiation of finding a time with someone outside your organisation. The free plan gives you exactly one active event type, so you can offer a 30-minute call or a 15-minute one, not both.
Questions
A genuinely usable free tier with paid plans for volume or team features. One active event type on the free plan, and the booking page carries Calendly branding.
Yes. Calendly sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
One active event type on the free plan, and the booking page carries Calendly branding.
Alternatives
Same category or same task, ordered by how closely they overlap.
cal.com
Open-source scheduling links you can run on your own server
doodle.com
Propose several times and let a group tick the ones that work for them
easyretro.io
Runs a retro as a board of cards people add, vote on and group
mentimeter.com
Live polls and word clouds that build on screen as people answer
mural.co
A shared canvas of sticky notes for running a workshop remotely
slido.com
Collects audience questions and upvotes them so the best ones rise