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QT Project 一个跨平台的C++应用程序开发框架。代码库托管在Google提供的Gerrit上（https://contribute.qt-project.org/），目前仅列出了有 Mirror 到 GitHub的项目。

Apache Airflow (or simply Airflow) is a platform to programmatically author, schedule, and monitor workflows.

The Apache Tomcat® software is an open source implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies. The Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket specifications are developed under the Java Community Process.

ArduPilot is the most advanced, full-featured, and reliable open source autopilot software available. 

Apache Cassandra is a highly-scalable partitioned row store. Rows are organized into tables with a required primary key.

The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models.