Confluence is a popular enterprise Wiki from Atlassian which also has some integration with JIRA
You can embed many types of data into Confluence, including Clarizen widgets which can be embedded as iFrames.
Embed iFrames in Confluence via the Other macros option
Now get your widget URL from Clarizen.
You do not need the iframe code (checkbox option)
Back in Confluence add your URL
Not all of the Iframe parameters are important.
Set: Width (px), Height (px), Align, Frameborder = hide,
Set: Margin Height 0px, Margin Width 0px, Scrolling = Auto
Here’s how it looks in Edit mode in Confluence
And here is an example of the View mode (with a different widget)