DXSpider is a Ham Radio program that connects to other similar programs by radio or the internet and provides a real-time information service to Ham Radio operators rather like IRC. It is designed to become a complete replacement for the original DOS implementation written by Dick Newell AK1A.
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.
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.