Similar to Postfix

Apache Derby

Apache Drill

Formatting Objects Processor

Apache Harmony

Apache HTTP Server

Apache Kafka

Apache Mahout

Apache OpenEJB

Apache OpenJPA

Apache OpenNLP

OpenOffice Writer

Apache POI

Apache Portable Runtime

Apache Solr

Apache Spark

Sqoop

Apache Subversion

Apache Thrift

Apache Tomcat

Apache Xalan

Apache Xerces

Apache ZooKeeper

APBS (software)

AppleWin

Ark (software)