Interesting. I’m definitely missing a decent PDF editor.

Looks like they support a lot of PDF features, but not PDF 2.0 yet.

I was also interested in what underlying PDF library they are using. Looks like their own library is part of the project or if not, based on Qt if they provide anything.

The licensing is a bit confusing. The website talks about being LGPL, then about goal of being more permissive then GPL, but in the repository README, it talks about how the project was relicensed from LGPL to MIT, and license file is MIT. Seems like it was just the website intro missing an update. So: MIT.