Wage or salary? (Score 1)

If you are a wage employee (paid hourly) then you should get extra compensation for your work. If you are salaried, guess what, you're always on the clock. The idea being that certain types of employees aren't just working during work hours, you're often thinking about problems driving home, etc. This is why many companies have a form you sign when you start work indicating that anything you develop at work or away may be the property of the company. That said, managers always have leeway to grant spot bonuses, good raises, etc. Talk to your manager. If she/he isn't willing to work with you, don't give them the software at all. I'm guessing they are probably willing to meet you half way.