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What is Citus? * Open-source PostgreSQL extension (not a fork) * Scalable across multiple hosts through sharding and replication * Distributed engine for query parallelization * Highly available in the face of host failures Citus horizontally scales PostgreSQL across commodity servers using sharding and replication. Its query engine parallelizes incoming SQL queries across these servers to enable real-time responses on large datasets.

MonetDB is an open source column-oriented database management system developed at the Centrum Wiskunde & Informatica (CWI) in the Netherlands. It was designed to provide high performance on complex queries against large databases, such as combining tables with hundreds of columns and multi-million rows. MonetDB has been applied in high-performance applications for data mining, online analytical processing, geographic information systems, XML Query (XQuery), text and multimedia retrieval.

Mongo (from "humongous") is a high-performance, open source, schema-free, document-oriented database. A common name in the "NOSQL" community.

It is pretty easy to gather status information from all sorts of things, ranging from the temperature in your office to the number of octets which have passed through the FDDI interface of your router. But it is not so trivial to store this data in a efficient and systematic manner. This is where RRDtool kicks in. It lets you log and analyze the data you gather from all kinds of data-sources. The data analysis part of RRDtool is based on the ability to quickly generate graphical representations of the data values collected over a definable time period.

MySQL Connector ODBC is an ODBC driver for interfacing to MySQL databases.

Namazu is a full-text search system intended for easy use. Not only it works as a CGI program for a small or medium scale Web search engine, but also works as a personal use search system for your pile of emails. (The Japanese word `Namazu' means `catfish' in English)

Firebird is a relational database offering many ANSI SQL-99 features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers. It has been used in production systems, under a variety of names since 1981. Firebird is completely free of any registration, licensing or deployment fees. It may be deployed freely for use with any third-party software, whether commercial or not.

OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase. OpenTSDB was written to address a common need: store, index and serve metrics collected from computer systems (network gear, operating systems, applications) at a large scale, and make this data easily accessible and graphable.

Oracle 7 client

DBD::SQLite =========== SQLite is a small fast embedded SQL database engine. DBD::SQLite embeds that database engine into a DBD driver, so if you want a relational database for your project, but don't want to install a large RDBMS system like MySQL or PostgreSQL, then DBD::SQLite may be just what you need. It supports quite a lot of features, such as transactions (atomic commit and rollback), indexes, DBA-free operation, a large subset of SQL92 supported, and more.