SwapSpec is a Data Broker plugin that allows one to easily change from primary and secondary specs. It also displays your current talent point distribution.

To change between specs either click the displayed point distribution or use one of the following commands:
/SwapSpec
/SS

Option screen allows you to hide or show the learned/unlearned spam and the text on the button label. Also can change the point distribution in the label to a custom spec name. To open the option menu use the addon tab on the interface screen, right click the button, or follow the slash command with the word 'options'

For details displaying Data Broker plugins please see Data Broker's wiki
Displaying in FuBar it is as simple as installing Broker2Fubar

Even without installing an addon such as FuBar or Titan Panel for Swap Spec to plug into the slash commands will still function properly