1. Donantions (add a pal pal link).
2. Up-sells:
a. Have a paid version thats got a few more bits.
b. Charge to install it.
c. Have paid plug-ins such as themes. Just like wp. It has paid and free plug-ins.
d. Charge for other softwear on your site.
e. Charge for customizing the softwear.
f. Charge for an add-free version or a version without your web address on it.
3. Goodies. Such as t-shirts and so on.
4. Have an 'app store' so if others add softwear that they want to charge for they sell it via your site.
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