Platypus

https://en.m.wikipedia.org/wiki/Claus_Wedekind

Maybe a weird take, but check out some fencing shoes. There’s a ton of variety but they seem to have the traits you’re looking for:

• Rounded heel
• Responsive up in the toes
• Generally look like normal street shoes

It’s FOSS and decentralized/supports self hosting, plus has a large following in fediverse circles so it gets colloquially lumped in

Mlem also supports keyword filters

Those are arguably the most “made for humans” languages—they’re made to make humans laugh and/or headbutt a railroad spike in frustration