From IFORS Developing Countries OR Resources
GATE is open source free software; users can obtain free support from the user and developer community via GATE.ac.uk or on a commercial basis from our industrial partners. We are the biggest open source language processing project with a development team more than double the size of the largest comparable projects (many of which are integrated with GATE2). More than €5 million has been invested in GATE development3; our objective is to make sure that this continues to be money well spent for all GATE's users.
Link to website: https://gate.ac.uk/overview.html