Hygger - Hygger - is an Agile project management tool with built-in prioritization.
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.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Validated ideas - List of 5,000 poorly executed but popular apps
Infinity - Infinity is a fully flexible work management platform where you can organize all your work, your way.
MarketPlan - Plan, execute, analyze & optimize your marketing