LMDB is described as 'An ultra-fast, ultra-compact, crash-proof key-value embedded data store' and is an app. There are more than 10 alternatives to LMDB for a variety of platforms, including Linux, Mac, Windows, Android and Self-Hosted apps. The best LMDB alternative is SQLite, which is both free and Open Source. Other great apps like LMDB are Firebird, UnQLite, LevelDB and Berkeley DB.
GNU dbm (or GDBM, for short) is a library of database functions that use extensible hashing and work similar to the standard UNIX dbm. These routines are provided to a programmer needing to create and manipulate a hashed database.
