Berkeley DB is a library created in 1994.

Berkeley DB (BDB) is a software library intended to provide a high-performance embedded database for key/value data. Berkeley DB is written in C with API bindings for C++, C#, Java, Perl, PHP, Python, Ruby, Smalltalk, Tcl, and many other programming languages. BDB stores arbitrary key/data pairs as byte arrays, and supports multiple data items for a single key. Read more on Wikipedia...

• Berkeley DB Wikipedia page
• Berkeley DB first developed in Sleepycat Software and Oracle Corporation
• Berkeley DB is written in C