Is Fossify.org legit?

I've been browsing f-droid when I noticed a bunch of apps like "Fossify calendar" that looked similar to apps starting with "Simple" - simple gallery, simple file manager, etc. I wanted to understand more on what are the ties and apparently, simple mobile tools are no good

So does someone know if Fossify are legit? Page looks iffy but code seems to be just forks.
Anyone has some info on them?