SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
Pocket Code
MIT App Inventor
Kodular
Qt Creator
Android Studio
Xamarin.Android
IntelliJ IDEA
Rider
SourceForge
Pocket CodeGitHub - 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.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Kodular - Much more than a modern app creator without coding
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.