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Solr is the popular, blazing fast open source enterprise search platform from the Apache Lucene project. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, and rich document (e.g., Word, PDF) handling. Solr is highly scalable, providing distributed search and index replication, and it powers the search and navigation features of many of the world's largest internet sites.


Compass is a real time searchengine. It is built on top of lucene. It is transactional, distributed, supports Spring MVC, integrates with Hibernate.


Git is a free & open source, distributed version control system designed to handle everything from small to very large projects with speed and efficiency.

Ganglia - scalable distributed monitoring system

Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization.

Cassandra - Scalable Distributed Database

The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model. Cassandra is suitable for applications that can't afford to lose data. Data is automatically replicated to multiple nodes for fault-tolerance.

Darcs - Distributed Revision Control in Haskell

Darcs is a distributed advanced revision control system written in Haskell. It is similar to Git, Mercurial and Bazaar. User will have own personnel repository and commits his changes to it. Later the changes are pushed to the centralized repository. Every repository is a branch and it provides support to integrate the changes between them. It provides support to send the changes by email.

ZeroC - Internet Communications Engine

The Internet Communications Engine (Ice) is a modern object-oriented middleware with support for C++, .NET, Java, Python, Objective-C, Ruby, and PHP. Its latest release has support for Android and .NET Framework. It helps to build distributed applications easier as it takes care of all interactions with low-level network programming interfaces. It supports cross-language and cross-platform communication.

IndexTank - Search Engine powers Reddit

IndexTank search engine powers search in Reddit, Social bookmarking site. IndexTank is acquired by LinkedIn and released the project as open source. It includes features like Variables boosts, Facets, Faceted search, Snippeting, Custom scoring functions, Suggest, and Autocomplete.

Hypertable - A high performance, scalable, distributed storage and processing system for structured

Hypertable is based on Google's Bigtable Design, which is a proven scalable design that powers hundreds of Google services. Many of the current scalable NoSQL database offerings are based on a hash table design which means that the data they manage is not kept physically ordered. Hypertable keeps data physically sorted by a primary key and it is well suited for Analytics.

Project-voldemort - A distributed database, Clone of Amazon's Dynamo

Voldemort is a distributed key-value storage system. Data is automatically replicated over multiple servers. Data is automatically partitioned so each server contains only a subset of the total data. Server failure is handled transparently. It is used at LinkedIn for certain high-scalability storage problems where simple functional partitioning is not sufficient.