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.
Lean Canvas - Business plans take too long to write, are seldom updated, and almost never read by others but documenting your hypotheses is key. Lean Canvas solves this problem using a 1-page business model.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
HMTMAA - Clever tool to estimate cost of building an app
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Confirmic Cookie Widget - The only cookie solution designed with great UX in mind