Jira may be extremely sluggish and require a large amount of memory on the client side.
Liveplan - LivePlan helps entrepreneurs and small-to-medium size business owners build dynamic business plans and track performance against their goals.
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.
Bizplan - Modern business planning for startups
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.
Cuttles.io - Develop your idea, write your plan & build your startup
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.