Developers
MVEL was created and is still primarily developed by Mike Brock. Significant contributions to MVEL have been made by Mark Proctor of the JBoss Drools Project.
Various commits and bugfixes have been contributed by:
Bob McWhirter (of Codehaus, Groovy Fame)
Pablo Lalloni
License
We use the Apache 2.0 License. So yes, you're safe to use MVEL in commercial products. You may also inline MVEL's classes into a single JAR alongside other products, however any re-branding or re-badging of MVEL itself is prohibited.