Preview virtual spaces in menu bar (like ubuntu)
Googling I was able to find this commercial app that looks like it does what you want. It's called TotalSpaces2 and looks to cost ~$12 US.

There a overview video that highlights all of its features. You can see an overview of all the apps on your various spaces as shown below:



From the look of the docs &amp; features I think what you're looking for is the Overview Grid. That's shown above in a larger spread of spaces and below with a smaller spread.