It's a long shot, but a viable alternative to Google Maps or other proprietary mapping websites (and no, OpenStreetMap is not a viable Google Maps alternative).

EDIT: Not sure why downvotes, OpenStreetMap doesn't even have directions as far as I can tell.

Partiful / evite. There’s not much out there that’s a good simple replacement.

Im late to the party I know but, google wallet/gpay

Two categories, broadly: any professional software, with deep features and professional quality.

I know theres audacity, but that's really not an acceptable saw.

I know theres a few cad apps, but no professional I've ever met finds the good enough.

I know gimp, and I use it, but no artist I know does; they all pirate Photoshop. Literally every one.

I like having audacity to record audio. I like having gimp to fuck with shit. I like having various cad apps to bang out organizational tools to print. These things do generally fit my use case. But I still have to help people pirate everything else and god the DRM is do fucking annoying.

Abd here's the more esoteric ask:

Not so much programs as features; Why aren't we really going all in on shit we can do that they can't? Features capitalists would never add, never support? Instead I find open source software always playing catch-up, and theres no reason it has to.

Dating app. An app that help people metting each other based on their interest and purpose local activity. :)

I would love to see an Open Source alt to AlchemyRPG

I love using their scenes when playing DnD online, but their privacy policy leaves a lot to be desired