xtalfind checks whether any XTAL is suitable for a HAM radio circuit (TX, RX). Given a base XTAL frequency, it shows you all possible uses within HAM bands. It features CW TX and direct conversion RX. It supports 455kHz, 10.7MHz, and custom IF value receivers, DRM, and SDRadio applications.
YFKlog is a general purpose ham radio logbook for Unix operating systems. It runs in text mode, which means it can easily be used on a remote server, even from Windows computers with PuTTY. It features a simple console-based user interface, a MySQL or SQLite database backend, the ability to manage an unlimited number of logs, ADIF import and export, easy log backup, high quality QSL (cards and labels) printing with LaTeX, award tracking/statistics functions, and ARRL LOTW support.
Fldigi is an encoder/decoder program for amateur radio digital communications with a digital modem on Linux. It interfaces to the user's radio via the sound card and optionally the serial port. It supports the following digital modes: CW, DominoEX 4, DominoEX 5, DominoEX 8, DominoEX 11, DominoEX 16, DominoEX 22, Feld-Hell, FSK-Hell, FSK-Hell 105, MFSK-8, MFSK-16, MFSK-16 pix, PSK-31, QPSK-31, PSK-63, QPSK-63, PSK-125, QPSK-125, PSK-250, QPSK-250, OLIVIA, RTTY, Throb-1 Throb-2, Throb-4, ThrobX-1, ThrobX-2, ThrobX-4, WWV, and Freq Analysis.
CWBot is an IRC bot to provide online services in Morse usable with the CWirc client. It can broadcast world news in Morse and Hellschreiber, RAC ham news, act as a MorseMail to CWirc repeater, be a CW tutor, or send fortune cookies in Morse, over an IRC channel or through DCC chat, with adjustable keying speed and Farnsworth spacing. It is easily extendable with scripts or external programs to provide additional services in Morse.
PicoStreamer is a complete server for live audio/video streaming. It can stream MP3, AAC, and video live using Flash FLV. It does not require any Flash server. It only needs a Web server with Perl and PHP. It requires neither expensive dedicated servers nor compilation on the target machine. A source client (for Win32) is included. A management/playing framework written in PHP makes PicoStreamer simple to use. The PicoIcy component acts as a local shoutcast server emulator, so you can use your preferred shoutcast source client to stream or stream Flash format directly from the Web.