The plugin for the MQX RTOS allowed the user to double-click on each task to view the current line of code where the task was operating (even for blocked tasks). This was a very helpful tool. Is there a similar functionality with the FreeRTOS plugin? If not, what is the best way to get this information?

Which IDE are you using?

Also, which architecture are you using? (we support nearly 40 architectures, and about 18 compilers)

Using IAR, many different processors, but right now, STM32F152 and STM32F7.

As far as I know IAR only has what I call a 'state viewer' in that it will show you a snap shot of the task state, but it is not truly thread aware in that it won't show you their stacks.

We did this all the time using IAR with MQX. Are there other IDE's that would give me this capability with FreeRTOS?

You could look up ThreadSpy (might be two words) from Code Confidence (Google will find it). Not free though.