FSF: GNU Radio controls the ISEE-3 spacecraft
The Free Software Foundation has put out a press release on the use of free
software to recover control of the ISEE-3 spacecraft.
"To do this, the group turned to GNU Radio, a free software
toolkit for implementing software-defined radios and signal processing
systems. Modifying the software to communicate in the 1970s satellite
protocol, members of the reboot project were able to gain access to the
spacecraft and fire its thrusters in early July, and will soon attempt to
move the satellite into an orbit close to Earth."