Nullboard - Minimalist locally-stored kanban board / task list manager.

Dubsado - Dubsado is flexible — it gives you 5 (now 6!) ways to add new leads. Best of all, 5 ways are automated.

OpenHub for GitHub - Fast and concise, open-source GitHub client app.

Harlow - Harlow helps freelancers get organized, save time, and look professional with automated invoicing, proposal templates, and much more—all from one centralized hub.

Huboard - HuBoard is built from the ground up using the GitHub public API.

Hecticapp.com - Hectic is a single digital workspace with all the tools needed to start, manage and grow a freelancing business, with a built-in personalized community to help freelancers connect with others, develop and refine their craft and get help from experts.