> Students and hobbyists can use Symbolica for free. Once Symbolica is being used professionally, either in an academic context or in a commercial company, a license is required. The preferred license model for academic use is an institution-wide license.

while i do not believe the author has any obligation to license it under an open-source license, i think people who use it under a proprietary license are being foolish. a cas is an essential tool for day-to-day work, and becoming dependent on a proprietary software vendor for that usually ends badly

(repost from elsethread)