Anima App - Design, get feedback, convert to code, publish, iterate.
ActiveState - ActiveState offers a PaaS-based infrastructure that enables developers to build and deploy apps to the cloud.
Sketch Repo - Collection of resources for anyone who uses Sketch
Nitrous - Nitrous is a web-based development platform that allows developers to collaborate on their projects in real-time, deploy to production servers with one-click, and to snapshot their projects quickly and easily.
Auto-Layout for Sketch - Responsive design for Sketch
Bannerboo.com - Bannerboo is the world's easiest online banner maker.