Apache Mahout

Apache Mahout(TM) is a distributed linear algebra framework and mathematically expressive Scala DSL designed to let mathematicians, statisticians, and data scientists quickly implement their own algor...
Language(s): Java, Scala
Operating system(s): Cross-platform
License: Apache 2.0

Apache OpenOffice

Apache OpenOffice (AOO) is an open-source office productivity software suite. It is one of the successor projects of OpenOffice.org and the designated successor of IBM Lotus Symphony. It is a close co...
Language(s): C++, Java
Operating system(s): Linux, Mac OS, Windows
License: Apache License 2.0

Apache Spark

Apache Spark is an open-source cluster-computing framework. Spark provides an interface for programming entire clusters with implicit data parallelism and fault tolerance. Apache Spark achieves hig...
Language(s): Scala, Java, Python, R, SQL
Operating system(s): Microsoft Windows, Mac OS, Linux
License: Apache License 2.0

Ardour

Record, Edit, and Mix on Linux, macOS and Windows. Ardour's core user group: people who want to record, edit, mix and master audio and MIDI projects. When you need complete control over your tools...
Language(s): C++ (with a little C and assembler thrown in where it makes sense)
Operating system(s): Linux, Mac OS, Window
License: GNU General Public License v2

Asterisk (PBX)

Asterisk is a free and open source framework for building communications applications. Asterisk is a software implementation of a telephone private branch exchange (PBX). It allows telephones interfac...
Language(s): C
Operating system(s): N/A
License: GNU General Public License v2