Mergefly - A modern UI for GitHub pull requests
Axure - The most powerful way to plan, prototype and hand off to developers, all without code. Download a free trial and see why professionals choose Axure RP 9.
Monolist.co - The command center for engineers. Tasks, pull requests, messages, docs — all in one place
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
PullReminders - Review and release pull requests faster with Slack reminders and metrics.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project