GNU Common C++ is an portable, optimized class framework for threaded applications, supporting concurrent synchronization, inter-process communications via sockets, and various methods for data handling, such as serialization and XML parsing. It includes the uCommon C++ library, a smaller reimplementation.

Twinkle is a softphone for your voice over IP and instant messaging communications using the SIP protocol. You can use it for direct IP phone to IP phone communication or in a network using a SIP proxy to route your calls and messages.

GNU SIP Witch is a peer-to-peer Voice-over-IP server that uses the SIP protocol. Calls can be made from behind NAT firewalls and without the need for a service provider. Its peer-to-peer design ensures that there is no central point for media intercept or capture and thus it can be used to construct a secure telephone system that operates over the public internet.

Mumble is an low-latency, high quality voice chat software primarily intended for use while gaming. Mumble consists of two applications for separate usage: mumble for the client, and murmur for the server.

GNU ZRTP C++ provides a library that adds ZRTP support to the GNU ccRTP stack and serves as library for other RTP stacks (PJSIP, GStreamer).

EXosip is a library that hides the complexity of using the SIP protocol for multimedia session establishment. This protocol is mainly to be used by VoIP telephony applications (endpoints or conference server) but might be also useful for any application that wish to establish sessions like multiplayer games.

Seren is a simple VoIP program based on the Opus codec that allows you to create a voice conference from the terminal, with up to 10 participants, without having to register accounts, exchange emails, or add people to contact lists. All you need to join an existing conference is the host name or IP address of one of the participants.

Baresip is a portable and modular SIP user agent with support for audio and video, and many IETF standards such as SIP, SDP, RTP/RTCP, STUN, TURN, ICE, and WebRTC.

Tilix is a tiling terminal emulator following the Gnome Human Interface Guidelines. Its features include:

1. Layout terminals in any fashion by splitting them horizontally or vertically.

2. Terminals can be re-arranged using drag and drop both within and between windows.

3. Terminals can be detached into a new window via drag and drop.

4. Input can be synchronized between terminals so commands typed in one terminal are replicated to the others.

5. Supports notifications when processes are completed out of view.

Tilda is a terminal emulator similar to normal terminals like gnome-terminal (GNOME) or Konsole (KDE), with the difference that it drops down from the edge of a screen when a certain configurable hotkey is pressed. This is similar to the built-in consoles in some applications. Tilda is highly configurable through a graphical wizard.

foot is a terminal emulator for systems using the Wayland display server. It is designed to be fast, lightweight, and independent of desktop environments. It can be used as a standalone terminal and also has a server/client mode.

tmate is a terminal sharing application that allows you to share your terminal with other users over the Internet. tmate is a fork of tmux.

tio is a simple TTY terminal application which features a straightforward commandline interface to easily connect to TTY devices for basic input/output.

Eternal Terminal (ET) is a remote shell that automatically reconnects without interrupting the session. ET uses SSH to initialize a secure connection. Unlike SSH sessions, which must be killed and reconnected after a network outage an ET session will survive network outages and IP roaming. ET provides the same core functionality as mosh, while also supporting native scrolling and tmux control mode (tmux -CC).

Agg is a command-line tool for generating animated GIF files from asciinema-created terminal session recordings.

Kmscon is a terminal emulator based on Linux's KMS. It can replace the in-kernel VT implementation with a user-space console. Compared to the Linux console, kmscon provides enhanced features including XKB-compatible internationalized keyboard support, UTF-8 input/font support, hardware-accelerated rendering, multi-seat support, a replacement for mingetty, and more.

Libtermkey handles all the necessary logic to recognise special keys, UTF-8 combining, and so on, with a simple interface.

Libvterm is an abstract C99 library which implements a VT220 or xterm-like terminal emulator. It doesn't use any particular graphics toolkit or output system, instead it invokes callback function pointers that its embedding program should provide it to draw on its behalf. It avoids calling malloc during normal running state, allowing it to be used in embedded kernel situations.

Alacritty is a GPU-accelerated terminal emulator with a strong focus on simplicity and performance. With such a strong focus on performance, included features are carefully considered and you can always expect Alacritty to be blazingly fast. By making sane choices for defaults, Alacritty requires no additional setup. However, it does allow configuration of many aspects of the terminal. Note that you need support for OpenGL 3.2 or higher.

Bootterm is a terminal designed to ease connection to ephemeral serial ports. It features automatic port detection, port enumeration, support for non-standard baud rates, the ability to wait for ports to appear, and the ability to read and write via stdin and stdout.

TSM is a state machine for DEC VT100-VT520 compatible terminal emulators. It tries to support all common standards while keeping compatibility to existing emulators like xterm, gnome-terminal, konsole, among others.

Unibilium is a basic C terminfo library. It doesn't depend on curses or any other library. It also doesn't use global variables, so it should be thread-safe.

Termite is a minimal terminal emulator, with a slightly modified version of VTE exposing the necessary functions for keyboard text selection and URL hints. It was designed for use with tiling window managers.

This package provides a terminal emulator with hyperlink support. It's based on VTE and aimed at power users.