Reading the intro, I feel like I got a good hint about what this is. It sounded like "local first git for teams, without the hell of sharing patches via email".
I don't know what gitea or forgejo are, so comparisons wouldn't help me.
I can tell you. Forgejo is a git server (i.e. you can push to a remove that lives in a different machine) plus a web GUI that allows to list repos, list commits within a repo, navigate commits and files within a commit.
The license is Free and Copyleft.
The other day someone here coined JTPP - "Just the prompt, please", expressing preference for reading the prompt instead of the e-mail/article it produced. The reasons for that are rather obvious, but I think it applies to marketing copy in general.
With that in mind, I wonder what the original idea behind this project was - the "prompt" that someone got in their mind, which got them excited enough to build this. Reading the "original prompt" might make it easier to figure the product out. Marketing copy is "how we can make what we have look more alluring to people". The "original prompt" is directly answering "what we actually aspired to build".