[whitingx]

https://ux.stackexchange.com/ < has a built in version of the Balsamiq (https://balsamiq.com/) UI drawing tool.

There is a write up on the integration here - https://blog.balsamiq.com/uxstackexchange/

[neves]

It looks really cool, but it looks like a handcoded integration. The OP wouldn't be able to integrate with his/her forum/blog software.