IBM DB2 11.1 is freely available for development.
There are many editions, but I recommend IBM Db2 Developer-C that is full featured and compatible with the commercial offering. There are some limitations of database size and memory usage, but it should be more than enough for development.
https://www.ibm.com/us-en/marketplace/ibm-db2-direct-and-developer-editions
If you want to download only the DB2 JDBC drivers see:
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