Tessel is open source. 
The Tessel Project is under open governance. Keep up with us on our blog and talk to us on the forums.
Tessel and modules are open source software (OSS) and open source hardware (OSHW).
Tessel 2
Software
Hardware
Datasheets
- Processor
- Co-Processor
Modules
Hardware files below are PDF and DipTrace schematics for Tessel's modules. Board layout files (and supporting files for silkscreen) are provided in DipTrace format.
Hardware files and designs are licensed under CC-BY-SA.
Software files are dual licensed MIT and Apache 2.0.
Accelerometer
Ambient
Audio
BLE
Camera
Climate
GPRS
GPS
Infrared
MicroSD
NRF24
Relay
RFID
Tessel 1
Software
Hardware
Below are PDF and DipTrace schematics for Tessel. Board layout files (and supporting files for silkscreen) are provided in DipTrace format.
All files and designs are licensed under CC-BY-SA.
*NOTE: many components on the board lack proper 3D models (we used the closest thing we could find), so don't trust them to more than ~0.5mm. Board dimensions and holes are correct, though.