Poly by Google is a library of free 3D objects for augmented and virtual reality apps.
Vectary 2.0 is an online collaborative design tool that changes the way design teams create 3D content for web, AR or VR. Think of Google Docs for 3D design. Super simple UI makes it easy for beginners and pros. Create 3D for web, typography or UX mockups by drag&drop and render visuals in minutes.
Generate custom 3D device mockups in your browser.
threed.io is a browser based tool to generate custom device mockups on the fly. Upload your Designs, make adjustments and download your custom mockup! Even works pretty nice on mobile. We're still in beta, but if you're interested in threed, please read the about text on the site.
Poly API by Google
A free API for Poly. Development in 3D made simple.
With the new Poly API, you can access our growing collection of creative commons 3D assets and interact directly with Poly to search, download, and import objects dynamically across desktop, mobile, virtual reality, and augmented reality.
TheoremJS is a mathematical framework that is packed up with tons of useful mathematical functions. It is composed of functions in most mathematical fields such as algebra, number theory, statistics, etc... It was designed to fit your need, whatever you are trying to do.