I've made an open source tool for scheduling posts to Lemmy, you can find it at https://schedule.lemmings.world. It can be used by users from any instance!

You can also schedule pinning and unpinning of posts from a community if you're the moderator, making it possible to schedule for example weekly/daily threads as well as their pinning and unpinning.

Another great feature is the possibility to select multiple communities to post into.

Let me know what you think!

P.S. This post was created using the tool!