JMIBBrowser is a 100% java based (and 100% free) MIB Browser. It supports GET and SET queries for SNMP enabled devices. MIB Files can be dynamically loaded and can be browsed in the MIB Tree. It is a great tool if you want to get started with the SNMP protocol.
At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.