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HPCC is a proven and battle-tested platform for manipulating, transforming, querying and data warehousing Big Data.
It supports two type of configuration. Thor is responsible for consuming vast amounts of data, transforming, linking and indexing that data. It functions as a distributed file system with parallel processing power spread across the nodes. Roxie, the Data Delivery Engine, provides separate high-performance online query processing and data warehouse capabilities.
OpenStreetMap is a free editable map of the whole world. It allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth. It is a wikipedia for maps. It is the project that creates and provides free geographic data and mapping to anyone who wants it.
Koloboke aims to replace the standard Java collections and streams with more efficient implementations. The current version of Koloboke focuses on replacing java.util.HashSet and java.util.HashMap. It provides a complete set of primitive type implementations for each collection. Its able to avoid the expensive boxing/unboxing of primitives and saves memory for boxed primitive objects. It is the fastest and the most memory efficient library implementing hash maps and sets.
soapUI is the world leading Open Source Functional Testing Tool, mainly it is used for Web Service Testing. Its features include Web service testing, Load testing, Functional testing, SOAP recording, Service mocking, Integrated reporting and lot more.
WinSCP is an open source free SFTP client, SCP client, FTPS client and FTP client for Windows. Its main function is file transfer between a local and a remote computer. Beyond this, WinSCP offers scripting and basic file manager functionality.
Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming.
The Google Guava Libraries are a nice set of Java utility classes that will probably come in handy in any project. It provides immutable collections, string manipulation, handling primitives ,easier I/O, concurrency etc. it absolutely follows the Collections API requirements. It has support for murmur hash.