Belle-sip is a modern library implementing SIP transport, transaction and dialog layers. It is written in C, with an object-oriented API. It also comprises a simple HTTP/HTTPS client implementation.

BCUnit is a fork of the defunct project CUnit, with several fixes and patches applied. It is a unit testing framework for writing, administering, and running unit tests in C.

BcG729 is an implementation of both encoder and decoder of the ITU G729 speech codec. The library written in C 99 is fully portable and can be executed on many platforms including both ARM and x86 processors. It supports concurrent channels encoding and decoding for multi call application such as conferencing.

MsOpenH264 is an H.264 encoder/decoder plugin for mediastreamer2 based on the openh264 library.

BZRTP is an implementation of ZRTP keys exchange protocol, written in C. It is fully portable and can be executed on many platforms including both ARM and x86.

MSWebRTC is a plugin of MediaStreamer, adding support for WebRTC codec. It includes features from WebRTC, such as, iSAC and AECM.

Belr is Belledonne Communications' language recognition library, written in C++11. It parses text inputs formatted according to a language defined by an ABNF grammar, such as the protocols standardized at IETF.

Belcard is a C++ library to manipulate VCard standard format.

BcToolBox is an utilities library used by Belledonne Communications software like belle-sip, mediastreamer2 and linphone.

BcMatroska is a free and open standard multi-media container format. It can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. This project provides a convenient distribution of the Matroska multimedia container format.

LIME is an encryption library for one-to-one and group instant messaging, allowing users to exchange messages privately and asynchronously. It supports multiple devices per user and multiple users per device.

Liblinphone is a high-level SIP library integrating all calling and instant messaging features into an unified easy-to-use API. It is the cross-platform VoIP library on which the Linphone application is based on, and that anyone can use to add audio and video calls or instant messaging capabilities to an application.

Linphone is a SIP softphone for voice and video over IP calling (VoIP) and instant messaging. Amongst its features are:

• High Definition (HD) audio and video calls

• Multiple call management (pause and resume)

• Call transfer

• Audio conferencing (merge calls into a conference call)

• Call recording and replay (audio only)

• Instant Messaging with message delivery status (IMDN)

• Picture and file sharing

• Echo cancellation

• Secure user authentication using TLS client certificates

• SRTP, zRTP and SRTP-DTLS voice and video encryption

• Telephone tone (DTMF) support using SIP INFO or RFC 4733

• Audio codecs: opus, speex, g711, g729, gsm, iLBC, g722, SILK, etc.

• Video codecs: VP8, H.264 and H.265 with resolutions up to 1080P, MPEG4

UnionFS-FUSE is a flexible union file system implementation in user space, using the FUSE library. Mounting a union file system allows you to "aggregate" the contents of several directories into a single mount point. UnionFS-FUSE additionally supports copy-on-write.

libnetfilter_queue is a userspace library providing an API to packets that have been queued by the kernel packet filter. It is is part of a system that deprecates the old ip_queue/libipq mechanism.

The libnl suite is a collection of libraries providing APIs to netlink protocol based Linux kernel interfaces. Netlink is an IPC mechanism primarily between the kernel and user space processes. It was designed to be a more flexible successor to ioctl to provide mainly networking related kernel configuration and monitoring interfaces.

This package provides a Linux kernel module that will provide a serial device /dev/ttyebus with almost no latency upon receiving. It is dedicated to the PL011 UART of the Raspberry Pi.

snapscreenshot saves a screenshot of one or more Linux text consoles as a Targa (.tga) image. It can be used by anyone with read access to the relevant /dev/vcs* file(s).

Utilities for Linux's Ethernet bridging facilities. A bridge is a way to connect two Ethernet segments together in a protocol independent way. Packets are forwarded based on Ethernet address, rather than IP address (like a router). Since forwarding is done at Layer 2, all protocols can go transparently through a bridge.

Dual Function Keys is a plugin for interception-tools that allows one to send arbitrary keycodes when a given key is tapped or held.

As a consequence of its monolithic design, file system code for Linux normally goes into the kernel itself---which is not only a robustness issue, but also an impediment to system extensibility. FUSE, for "file systems in user space", is a kernel module and user-space library that tries to address part of this problem by allowing users to run file system implementations as user-space processes.

PRoot is a user-space implementation of chroot, mount --bind, and binfmt_misc. This means that users don't need any privileges or setup to do things like using an arbitrary directory as the new root file system, making files accessible somewhere else in the file system hierarchy, or executing programs built for another CPU architecture transparently through QEMU user-mode. Also, developers can use PRoot as a generic process instrumentation engine thanks to its extension mechanism. Technically PRoot relies on ptrace, an unprivileged system-call available in the kernel Linux.

ltrace intercepts and records dynamic library calls which are called by an executed process and the signals received by that process. It can also intercept and print the system calls executed by the program.

GNU Linux-Libre is a free (as in freedom) variant of the Linux kernel. It has been modified to remove all non-free binary blobs.