Tarantool is a Lua application server integrated with a database management system. It has a "fiber" model which means that many Tarantool applications can run simultaneously on a single thread, while the Tarantool server itself can run multiple threads for input-output and background maintenance. It incorporates the LuaJIT -- "Just In Time" -- Lua compiler, Lua libraries for most common applications, and the Tarantool Database Server which is an established NoSQL DBMS. Thus Tarantool serves all the purposes that have made node.js and Twisted popular, plus it supports data persistence.