If there's no signup and it's free, you have to very wary on what the "trick" is, because nothing is truly free. Most of the potentially useful ones looks like trial with locked features.
Or it could be some dude’s personal tool that’s easier to also make available to others. I do that a lot because remembering a custom domain is quicker than some CLI incantation.
For example: https://techletter.app – I use it to construct my newsletters. Markdown with a few customizations into HTML for WYSIWYG editors. It’s cheap enough to run that I don’t care if others use it. I think the AWS credits add up to $3/mo.
There should be separate categories for FOSS and no-hidden-monetization tools v.s. the other fly-in-the-soup tools where you have to drink around the fly...
