What are some alternatives?
When comparing Ranktab and Viima, you can also consider the following products
IdeaScale - IdeaScale is the leading innovation management software platform for the enterprise, government, and education.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
XMind - XMind is a brainstorming and mind mapping application.
Brightidea - Brightidea is an innovation management software to crowdsource tomorrow's ideas today.
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.