Wia
PlatformIO
Particle.io
Arduino IDE
Reality Editor
codebender
Losant IoT Platform
Embeetle IDE
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
Wia
SourceForgePlatformIO - Next-generation IDE for IoT
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.
Particle.io - Particle is an IoT platform enabling businesses to build, connect and manage their connected solutions.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Arduino IDE - Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware...
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.