QuickPages - Free forever landing page generator.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Unbounce - Unbounce lets marketers and businesses build, publish and test landing pages without IT or software. AI enhanved A/B testing and lead gen make it a powerful marketing tool.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
ARI Stream Quiz - Viral Quiz WordPress BuzzFeed like plugin with trivia and personality games support, lead form, boost social sharing
Basecamp - A simple and elegant project management system.