Lua-Sqlite3 is a binding of SQLite 3 for Lua. It is unique in contrast to other database bindings that it consists of two layers. The first layer translates the SQLite 3 implementation's C API to Lua. The second layers are interface layers, written in Lua. These layers provide a nice and smart view of the database.
lua-tinycdb is a binding to the tinycdb library by Michael Tokarev, which is a public domain implementation of Daniel J. Bernstein's Constant Database (cdb). A cdb is a key-value store (much like BDB/gdbm), but it cannot be updated at runtime (only rebuilt). Reading is very fast, and rebuilding is done atomically by building the new database and then renaming. lua-tinycdb includes the tinycdb source, so there are no external dependencies.
mydp is a program for processing mysqldump files in the manner of ‘awk’. It reads mysqldump SQL statements from standard input and executes Lua callback functions as table definitions and insert statements are encountered. The Lua callback functions are specified in a file passed to mydp via the command line. The callbacks are typically used to filter and process only a small subset of the MySQL dump data and/or save it for further processing. mydp is written in Lex and Lua.
MySQL Workbench is a cross-platform, graphical database modeling tool for MySQL. It allows you to create database models from scratch as well as by importing existing databases from SQL or DBDesigner4 models. You can then generate SQL code to CREATE databases, ALTER them, and export in various image formats and PDF/PS. Its extension system allows writing plugins and scripts in Lua, Python, and C++.
EJDB is an embedded JSON database engine. It aims to be a fast MongoDB-like NoSQL library that can be embedded into C/C++/Nodejs/Python3/Lua applications. It features collection-level write locking, collection level transactions, string token matching queries, and a Node.js binding.
Flora is a minimalistic but very powerful NoSQL database. It is easy to understand with data readable by both humans and machines, schemaless, Lua-scriptable, remotely accessible through TCP, and portable. It is especially suited for A. I. tasks, and a longer-term goal is support for "natural language" queries.