The only app that I've found that has all those features is "write" by styluslabs: https://styluslabs.com/. It isn't open source, but it is available for free. It's cross platform, with ios and android apps too. Seems like it's a passion project by a single developer. I've been extremely happy with all of its features. I use its whiteboard feature for collaboration, and I've found it to be lag free and a much... Source: about 1 year ago

I totally agree with you. One Note is fantastic and I would like to use it but not being able to open the notes in linux makes me avoid it. Do you know if there is a way of opening One Note notes in Linux without using the webapp? (I don't even need to edit them!) In the meantime, I'm using stylyslab write [0] which uses svgz and is a good replacement for OneNote and a compromise I'm willing to make to not be... - Source: Hacker News / almost 2 years ago

I've personally found write by styluslabs to have better pen input than xournal++ (using surface pen on surface go). Source: over 2 years ago

I've used MobisleNotes for over a decade as my go-to utterly barebones notes app for random thoughts / grocery lists / etc, but it's shutting down soon. I mostly used the checklist functionality which didn't require any special button presses to insert a checkbox, let you just swipe to the right (on mobile) to indent a row, and was all around fast to use. Every "substitute" I've found is either hyper-focused on... Source: about 2 years ago

For years now, I had been using https://mobislenotes.com/, which did everything above (except for the printing of checklists properly). However, they are shutting down their service on December 31st 2021, and I haven't been able to find a replacement app/service that has the features above (which is surprising, at least to me). I am fine paying for such an app service, either one-time or monthly (as it would... Source: over 2 years ago