Amateur Radio

• AMSAT - The Amateur Satellite Organization has a good resource of satellite related software.
• TAPR - The Tucson Amateur Packet Radio club is a great resource for packet radio information.

Tracking

• Bester - Provide an excellent satellite tracking software suite. We use their free version of Sattrack for visual displays.
• J-Pass Generator will mail you predictions.
• J-Track - Marshall Space Flight Center has developed a Java Applet tracking tool.
• Heavens Above - Online real-time satellite tracking data.
• Predict - Linux based satellite locator by KD2BD.

Keplerian Elements

• OIG - Get the latest keps at Goddard's Orbital Information Data site.
• AMSAT - Element sets for orbiting satellites carrying amateur radio (OSCARs).
• Celestrak - An excellent repository of elment sets.

IP in space/Remote Operation

• IP In Space - The NASA Goddard Space Flight Center is working on operating missions as nodes on the internet.
• Interplanetary IP - Vint Cerf has some interesting things to say on an Interplanetary Internet.
• WITS - The Web Interface for Telescience, a group at JPL working on remote operation via the Internet.

Linux

• AX.25 HOWTO - Documentation on installing AX.25 capabilities on Linux machines.
• HAMSOFT - A great repository of amateur radio software for Linux.