PaintCube might be a bit more popular than Open Startups. We know about 1 link to it since March 2021 and only 1 link to Open Startups. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Selling software applications that solve actual problems of businesses = yes, check out https://postmake.io/open https://www.indiehackers.com/. Source: almost 2 years ago
A cool demo might be Plasmo --> https://paintcube.co/ --> https://plushify.net/#/ --> physical toy. Source: over 3 years ago
Starter Story - Learn how others are building successful e-commerce businesses.
Sculptura - 3D sculpting for everyone
Startup Snapshot - Vivid behind-the-scenes startup stories, in photographs
Massless Pen - A pen for drawing in virtual reality
OpenStartup.dev - A collection of open startups
Nomad Sculpt - Nomad is a sculpting & painting mobile app, available on Android and iOS.