Berkeley DB (libdb) is a programmatic toolkit that provides embedded database support for both traditional and client/server applications. It includes b+tree, queue, extended linear hashing, fixed, and variable-length record access methods, transactions, locking, logging, shared memory caching, database recovery, and replication for highly available systems. DB supports C, C++, C#, Java, PHP, and Perl APIs. It supports key-value pair (NoSQL), SQL, and Java Object formatted data. It is available for a wide variety of Unix platforms as well as QNX, Android, Mac OS X, and several varieties of Windows.
Vedis is an embeddable datastore C library built with over 70 commands. It is similar in concept to Redis, but without the networking layer, since Vedis run in the same process of the host application. Unlike most other datastores (e.g. memcache, Redis), Vedis does not have a separate server process. It reads and writes directly to ordinary disk files. A complete database with multiple collections is contained in a single disk file. The database file format is cross-platform; you can freely copy a database between 32-bit and 64-bit systems or between big-endian and little-endian architectures.