Open Source C Telnet Software

The Null-modem emulator (com0com) is a kernel-mode virtual serial port driver for Windows. You can create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another. The HUB for communications (hub4com) allows to receive data and signals from one COM or TCP port, modify and send it to a number of other COM or TCP ports and vice versa.

A cross-platform ANSI-BBS terminal designed to connect to remote BBSs via telnet, rlogin, or SSH. Supports ANSI music and the IBM charset when possible. Will run from a console, under X11 using XLib, or using SDL.

ExtraPuTTY - fork of putty 0.67. (Add win32 API,shortcuts for pre-defined command,can use files instead of the registry,auto-reconnect, scripting a session with lua,integrates FTP,TFTP,Ymodem,Xmodem transfert protocols, integrates cygwin, zmodem, session manager,hyper link projects and others ...)

KiTTY is a lightweight, open-source SSH/telnet client and terminal emulator based on PuTTY, designed for use in Windows environments. It is primarily used for remote connections via SSH, Telnet, Rlogin, and serial protocols, making it an essential tool for system administrators, network engineers, and developers who need to manage remote servers or devices. KiTTY extends PuTTY's functionality with a variety of enhancements, such as session management, automated password handling, and portable executables, providing a more convenient and customizable experience. Its minimalistic design ensures fast performance, while its extended features cater to both basic and advanced users who require reliable, secure, and efficient remote access tools.

tn5250 emulates a 5250 terminal or printer over telnet, for connecting to IBM Power Systems, iSeries and AS/400 computers running IBM i, i5/OS and OS/400. It runs on any Unix or Windows system. Note that this project is now on GitHub at https://github.com/tn5250/tn5250

TinTin++ is a console mud client for any type of text mud or bbs. The mud client's main assets are an easy to learn scripting language, triggers, automapping, and a split screen interface to separate mud output from client input. Installation instructions for Android, iOS, and several other operating systems are available on the website. https://tintin.mudhalla.net

Qodem is a a terminal emulator that resembles the BBS-era Qmodem. Includes phonebook, scrollback, capture, X/Y/Zmodem, Kermit, ANSI (+ music) / Avatar / VT102 / Linux emulation, Unicode, and keyboard macros. Connects over serial, ssh, telnet, rlogin.

dtelnet: A Free Telnet Client for Windows 16/32/64 Emulates many terminal types 'linux,xterm,rxvt,konsole,vt100,vt320,vt420' (xterm[-256color] is the preferred), talks protocols 'telnet' and 'login'. Many customization options available.

The Clans was a popular game written for online BBSes back in the day of their great popularity. It is a text-based game featuring inter-BBS communications. It was written initially for Turbo C++, but has been ported to gcc and MSVC

KildClient is a mud client using the GTK toolkit. Its main feature is the support of Perl scripting. Other standard features of mud clients (triggers, gags, macros, etc.) are also supported.

SSH2 client for MacOS before X, based on BetterTelnet, lsh and GUSI.

I'm a HW Support and used cacti, zabbix, but they are too "strong", sometimes I just want to know server "worked fine", and show me a basicly load-average chart, that's enough. And the other hand, I need run command (like: "top", "iostat", "date" etc.) remotely and show it out to the webpage. The hwmonitor(writen in C) is a simple daemon, you can define some command-name(like: show_top= top -b -n1), telnet to this daemon and input your def-command(like: show_top), hwmonitor will return the info. And hwclient(include in this project, writen in C) connect to hwmonitor, input a define command-name to get server load-average and IO-idle each 60 seconds(you can change it) into a text file. hwgraphic (include in this project, writen in PHP) read the text file(generated by hwclient) and show the load-average chart and IO-idle chart.

KBtin is a MUD/MUSH/MOO/telnet client, a heavily extended clone of tintin++. It is not limited to games however, as it can be used to run any line-based program. It uses full screen text mode, with portability preferred over graphical looks.

OpenSource mud client designed to work on both windows,linux and MAC OS X. Written in Gtk+ and C with SQLLite, Python, MSP, MXP, HTML, and ZMP support. Provides plugin support, automapper functionality, triggers, aliases and macros.

Pure object based operating environment, script language, shell, loads plugins to extend functionality, it's a MUD gone awry.

FuTTY is a fork of PuTTY and PuTTYTray.

ICMP Shell (ISH) is a telnet-like protocol. It allows users to connect to a remote host and to open a shell using only ICMP to send and receive data. ICMP Shell was written in C for the UNIX environment.

MMC, the MUD client for UNIX and Win32. Main features: aliases, hotkeys, triggers list ordered by priority, MCCP, delayed/periodic commands, perl5 is used as a scripting language, writing sophisticated triggers and aliases is now simple and easy, and etc.

BBS style telnet chat server, influenced by GTalk, DDial, and Minichat with over 50 commands, and lots of features.

aftp is an FTP library and an FTP tool. The aftp tool is a good example on how to use the library. You need FTP functionality in your software? Use the aftp library! Now also atelnet(d), a client and server telnet between MS-Windows (server) and Linux.

Atani Software has a primary focus of developing games for various platforms and also try to keep the good old BBS' alive with releases of door games, etc.

Communication protocol for advanced clients of talker Atlantis (now running at atlantis.talker.sk). No implementation. No source code. Only specfication.

Colour ECMA-48/ANSI compatible telnet terminal for Win32/95/etc.

CGI-Shell gives you a shell using CGI. So everybody who has a CGI-directory on a web-server, also has its own shell on it - comparable with Telnet or SSH.

Clio is a MUD client specifically for MUD2 (a direct descendant of Trubshaw & Bartle's original MUD), but which can also be used with any MUD. Features include ANSI colour, colour logging, scroll back, function keys, command editing, and command history.