iobeya 
Recommended for Lean Organizations
iObeya helps organizations who already practice visual management take their visual boards online so they can be shared across locations.
A program manager at a local agile development shop pointed us to iObeya, and asked for our opinion on whether it would be a good tool for managing retrospectives. It could be, but this is not a tool for casual use. This is big, powerful software that you should use to enhance your meetings if you have it. In general, though, this isn't a first choice for businesses or teams who are still figuring out how they want to operate.
In the past year, iObeya added support for brainstorming and voting, making it now possible to fully support the KJ technique using this software. iObeya now enables collaborative creativity sessions. As the session leader, you can set the duration for the brainstorming and voting sessions, and actively participate throughout them. Because iObeya doesn't assume you'll do all your brainstorming and voting in real time, all participants are notified when a voting session is starting soon, and when it ends.
While we don't recommend iObeya as a first choice for groups looking to run a strategic planning or other one-time workshop, iObeya is one of our top recommendations for groups looking to run Dan Prock's Value Stream Mapping workshop with a remote team.
Also, check out this sweet demo video.
Reference: www.iobeya.com
Reference: https://blog.lucidmeetings.com/blog/25-tools-for-online-brainstorming-and-decision-making-in-meetings
