Avogadro - Avogadro is a free, fantastically easy to use molecule editor.
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.
ImageJ - and Other Health Care
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
ACD/ChemSketch - ACD/ChemSketch for personal and academic use brings the power of our structure drawing package to your home computer.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.