Japanese Text-to-speech system using HTS-engine and Mecab

http://open-jtalk.sourceforge.net/

Software implementation of the OpenAL specification

http://kcat.strangesoft.net/openal.html

Chemical toolbox designed to speak the many languages of chemical data

https://openbabel.org/wiki/Main_Page

Optimized BLAS library based on GotoBLAS2

https://github.com/xianyi/OpenBLAS

Small, fast, standards compliant, extensible window manager

http://openbox.org/

Open Chinese Convert library and utilities

https://github.com/BYVoid/OpenCC

Open Computing Language (OpenCL) specifications V3.0 (header files)

https://github.com/KhronosGroup/OpenCL-Headers/

OpenCORE implementation of AMR Narrowband & Wideband speech codec

http://sourceforge.net/projects/opencore-amr/

Middleware framework for smart card terminals

https://github.com/OpenSC/openct

Ming and Kai face of OpenDesktop fonts

http://opendesktop.org.tw

DKIM library and milter implementation

http://opendkim.org/

Port of OpenDoas: a portable version of OpenBSD's doas

https://github.com/Duncaen/OpenDoas

High dynamic-range (HDR) image file format

https://github.com/AcademySoftwareFoundation/openexr/

Enterprise instant messaging server

https://www.igniterealtime.org/projects/openfire/index.jsp

Fast and powerful code search and cross-reference engine

http://opengrok.github.io/OpenGrok/

Cisco implementation of H.264 codec

https://www.openh264.org/

Complex IPMI management software

http://openipmi.sourceforge.net/

Object-oriented SGML/XML parser toolkit and DSSSL engine

http://www.netfolder.com/DSSSL/

OpenJDK 11 FreeBSD binary

http://openjdk.java.net/

OpenJDK 17 FreeBSD binary

http://openjdk.java.net/

OpenJDK 21 FreeBSD binary

http://openjdk.java.net/

OpenJDK 24 FreeBSD binary

http://openjdk.java.net/

OpenJDK 8 FreeBSD binary

http://openjdk.java.net/

Open-source JPEG 2000 codec

https://www.openjpeg.org/

Open-source JPEG 2000 codec

https://www.openjpeg.org/

Open-source implementation of JPEG2000 Part-15

https://github.com/aous72/OpenJPH

Open source LDAP client implementation

https://www.OpenLDAP.org/

Open source LDAP server implementation

https://www.OpenLDAP.org/

Open source LDAP client implementation

https://www.OpenLDAP.org/

Open source LDAP server implementation

https://www.OpenLDAP.org/

High Performance Message Passing Library

https://www.open-mpi.org/

Network Time Protocol (NTP) daemon

https://www.openntpd.org/

Tools to accurately transfer 3-D geometry between applications

https://www.rhino3d.com/opennurbs

Implementation of the PGM reliable multicast protocol

https://code.google.com/p/openpgm/

Software to control a multitude of (a)RGB devices

https://openrgb.org

Implementation of rsync with a BSD (ISC) license

https://github.com/kristapsdz/openrsync

RISC-V SBI bootloader and firmware

https://github.com/riscv-software-src/opensbi

Libraries and utilities to access smart cards

https://github.com/OpenSC/OpenSC/wiki

Full-text search engine for Java

http://opensearch.org

Visualization dashboards for OpenSearch

https://opensearch.org

Visualization dashboards for OpenSearch

https://opensearch.org

Visualization dashboards for OpenSearch

https://opensearch.org

Visualization dashboards for OpenSearch

https://opensearch.org

Full-text search engine for Java

https://opensearch.org

Full-text search engine for Java

https://opensearch.org

Full-text search engine for Java

https://opensearch.org

Full-text search engine for Java

https://opensearch.org

Open-source implementation of the Service Location Protocol

http://www.openslp.org/

This package is a collection of SGML/XML tools called OpenSP

http://openjade.sourceforge.net/doc/

Graphical password applet for entering SSH passphrase

http://www.jmknoble.net/software/x11-ssh-askpass/