TrackDuck - Visual feedback for web design and development.
avocode - Centralize design collaboration, version control, prototyping, feedback, and developer hand-off with Avocode. Work on any design, anywhere, with anyone. Sign up free 👉 https://avocode.com/.
zipBoard - ZipBoard is a web-based visual bug tracking & issue tracking tool that helps developers, testers and project managers collaborate during website and elearning development.
Undesign - Free design tools and resources for your projects
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
2015 Design Tools - Results from survey of 4,000+ designers on their fave tools.