The creator of this (Chee Aun) is quite prolific and creative with their work (https://cheeaun.com/projects/). They created https://cheeaun.life, a timeline of their life, more than 10 years ago (which looks to be kept up to date), which was my inspiration for markwhen (https://markwhen.com). - Source: Hacker News / about 2 months ago

Looks like markwhen[0]. When making it, which initially started out as a strictly timeline-making tool, I realized it is essentially a log or journal language - write a date, any date, and add some stuff to it. Good for notes, blogging, a calendar, etc etc. [0] https://markwhen.com. - Source: Hacker News / 3 months ago

Https://markwhen.com I’ve had a lot of these thoughts when working on markwhen. It’s basically turning into a calendar and planning IDE, pretty excited about where it’s heading. - Source: Hacker News / 11 months ago

Https://markwhen.com maybe? Might be too manual for their use case though. - Source: Hacker News / 12 months ago

Https://markwhen.com - very cool. however, If I could share with you, I would see the value in following case: if I could connect my calendar(s) to it and see what is going on and overlay it with the data here in comment. Use case is both - for retrospective and for planning (for example if you're preparing the meeting and don't want to share content just yet, or jotting something for time in-between meeting what... - Source: Hacker News / about 1 year ago

Check out onlinegantt.com which is free. Source: about 1 year ago