humhub.org looks promising. AGPLv3 and Commercial licensing.

Also, can use a stool when I want to sit. Totally adjustable to your height.

I wanted to try a standing desk for as little cash as possible. I used some wire rack shelving and tie wraps. Similar to this - http://www.amazon.com/Seville-... Removed one shelf. Positioned the middle shelf at the appropriate height. Used the tie wraps and attached to the middle shelf to create an 'L' shaped work environment. Used shelf liners and nylon cutting boards for work surfaces. Left the wire rack for under my laptop for ventilation. Positioned my printer in the bottom rack for balancing weight. I love using this inexpensive and versatile setup.