The Solidification Using a Baffle in Sealed Ampoules (SUBSA) and Towards Understanding Pore Formation and Mobility During Controlled Directional Solidification in a Microgravity Environment Investigation (PFMI) furnaces were developed for operation in the International Space Station (ISS) Microgravity Science Glovebox (MSG). Both furnaces were launched to the ISS on STS-111, June 4, 2002, and are currently in use on orbit. The SUBSA furnace provides a maximum temperature of 850°C and can accommodate a metal sample as large as 30 cm long and 12 mm in diameter. SUBSA utilizes a gradient freeze process with a minimum cool down rate of 0.5°C/min, and a stability of +/0.15°C. An 8 cm long transparent gradient zone coupled with a Cohu 3812 camera and a quartz ampoule allows for observation and video recording of the solidification process. PFMI is a Bridgman type furnace that operates at a maximum temperature of 130°C and can accommodate a sample 23 cm long and 10 mm in diameter. Two Cohu 3812 cameras mounted 90° apart move on a separate translation system that allows for viewing of the sample in the transparent hot zone and gradient zone independent of the furnace translation rate and direction. Translation rates for both the cameras and furnace can be specified from 0.5 micrometers/sec to 100 micrometers/sec with a stability of +/-5%. The two furnaces share a Process Control Module (PCM) which controls sample processing, a Data Acquisition Pad (DaqPad) which provides signal conditioning of thermocouple data, and two Cohu 3812 cameras. The hardware and software allow for real time remote monitoring and commanding of critical process control parameters from the ground. This paper will provide a detailed explanation of the SUBSA and PFMI systems along with performance data and preliminary results from completed on-orbit processing runs.