Sculpteo
3D Hubs
i.materialise
Shapeways
Prototype Hubs
3DEXPERIENCE Make
Printify
Thangs3D
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
Sculpteo
SourceForge3D Hubs - Airbnb for 3D printing
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
i.materialise - i.materialise is an online 3D printing service, community and marketplace.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Shapeways - Shapeways - 3D Printing Service and Marketplace
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.