  We present an open source toolkit of flight-proven electronic devices which
can be used to track, terminate and recover high altitude balloon flights and
payloads. Comprising a beacon, pyrotechnic and non-pyrotechnic cut-down devices
plus associated software, the toolkit can be used to: (i) track the location of
a flight via Iridium satellite communication; (ii) release lift and/or float
balloons manually or at pre-defined altitudes; (iii) locate the payload after
descent. The size and mass of the toolkit make it suitable for use on weather
or sounding balloon flights. We describe the technology readiness level of the
toolkit, based on over 20 successful flights to altitudes of typically 32,000
m.
