GetJar
Amazon Appstore
F-Droid
Aptoide
SlideME
AndroidPIT
AppBrain
1Mobile Market
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
GetJar
SourceForgeGetJar is recommended for tech-savvy Android users who enjoy discovering new or lesser-known apps, and those who are comfortable evaluating the security of third-party application sources.
Amazon Appstore - The Amazon Appstore is a place to purchase and download apps for your Android device.
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.
F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Aptoide - Aptoide is a third party replacement for the traditional Google Play Store.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.