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).
JNSEDB is simple, persistable, fast and embeddable java nosql database dedicated to small applications. This database can be embedded to any java application without time wasting configuration. Add maven requirement and start using database.
IBM Cloudant is a NoSQL JSON document store that’s optimized for handling heavy workloads of concurrent reads and writes in the cloud; a workload that is typical of large, fast-growing web and mobile apps.