Couchbase is described as 'is the NoSQL database market share leader, with production deployments at AOL, Deutsche Post, NTT Docomo, Salesforce.com, Turner Broadcasting Systems, Zynga and hundreds of other organizations worldwide' and is an app in the Development category. There are more than 50 alternatives to Couchbase for a variety of platforms, including Linux, Windows, Mac, Online / Web-based and BSD. The best alternative is PostgreSQL, which is both free and Open Source. Other great apps like Couchbase are SQLite (Free, Open Source), MongoDB (Free), MySQL Community Edition (Free, Open Source) and MariaDB (Free, Open Source).
BigMemory: a commercial in-memory data management suite for real-time Big Data applications that stores up to hundreds of terabytes in distributed memory across multiple servers without performance hits from the Java garbage collector.
FrontBase was created to fill the need for a robust and scalable relational database server that was Internet enabled, had no downtime, and required zero administration. FrontBases speed, wide range of features, and flexible structure can give you the competitive edge.
Mini SQL, or mSQL, is a lightweight database engine designed to provide fast access to stored data with low memory requirements. As its name implies, mSQL offers a subset of SQL as its query interface.
MaxDB is an ANSI SQL-92 (entry level) compliant relational database management system (RDBMS) from SAP AG, which was delivered also by MySQL AB from 2003 to 2007. MaxDB is targeted for large SAP environments e.g.