Excel ?
I've got a RSLinx Gateway license, so I just "emulate" an HMI with Excel.
I'm usually ready to test aspects of my code before the HMI team is ready with their visualization, so I just make a few quick links between Excel and the PLC, maybe add some conditional formatting in Excel to help catch my eye, and I'm ready to test.
It's nice because I can create any formulas that I need, displaying text instead of status numbers, and organize the data the way that I need, not what the spec says the customer needs.
The "graphics" aren't great (although I have dropped a bitmap of a P&ID as my background, then used conditional formatting to change the color of the cell where the valves are located based on their status. Still crude, but it's fast and enough until the real HMI is ready (and is useful when I'm not near an HMI and need one).