Bubbl.us is a simple and free web application that lets you brainstorm online.

Website www.bubbl.us Top 100 Tools for Personal & Professional Learning 2017  –
Cost Free. Top 100 Tools for Workplace Learning 2017  –
Availability Online Top 100 Tools for Education 2017  –
Past Overall Rankings
2016: – 2015: – 2014: – 2013: – 2012: – 2011:90= 2010: 89 2009:55= 2008:83= 2007:-

Comments from some of those who selected bubbl.us as one of their Top 10 Tools 

“There are MANY available mind-mapping tools, but in my district I found bubbl.us useful due to the fact that it is not blocked by our administrators and does not require a registration in order to use it. Mind mapping is useful when working with vocabulary as well as when flowcharting work or creating a graphic organizer for writing assignments.” Mary Howard

“Online mindmapping. Use both with learners and for CPD planning” Leia Fee

“Simple collaborative mind-mapping tool”  Jason Denys