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Easily migrate from Snowflake, Redshift, or Databricks with free tools.
BigQuery delivers 54% lower TCO with exabyte scale and flexible pricing. Free migration tools handle the SQL translation automatically.
eXist-db is a feature rich Open Source native XML database
eXist-db is a native XML database featuring efficient, index-based XQuery processing, extensions for keyword search, XUpdate support, XSLT support, XForms support, REST and tight integration with existing XML development tools. Moved to Github - https://www.github.com/exist-db/exist
Java Objects Persistence Service (JOPS) is a simple and very useful library dedicated to developers who don't need all the power of traditional DBs (MySQL,Oracle.etc) but still need to be able to persist and manipulate their persisted objects easily
This is a base which stores knowledge in the form of nested sets
...Knowledge bases managed by artificial intelligence language, such as executable code can be written as in external files and in the elements of the base. The Knowledge Base is powerful enough, it can be used for indexing web contents.
Lightspoke Dbx is a fast XML database web service layer over Berkeley DB XML. Dbx offers xpath queries, native xml document management and web based administration of containers, documents and indexes. XSLT, security, full text indexing, xupdate planned
MCDb is a database record manager written in Java with indexing, locking, etc. MCDb is a library built to be used by other programs to manage small data sets of program settings, etc.
Omseek has been renamed to Xapian. Xapian is a Search Engine Library, written in C++ with bindings for Perl, Python, PHP, Java, Tcl, C# and Ruby. It allows you to easily add advanced indexing and search facilities to your applications.