The firmware and the demo disk are inside this page: it works offline and sends nothing anywhere else. A disk file you pick is read here, on this computer.
PT/FM is free software under the GPL-3.0-only, with its complete source in PT/FM's repository (fw/).
It runs on the device layer of SLOOP 2.4.1, after Felucca (Leo Kuroshita, Hügelton Instruments; GPL-3.0-only),
and this page installs through their installer scripts. The second core's start and hold follow work by Charles
Vestal, Kerem Kilic and zednaked (GPL-3.0-only). The DX7 follows MSFA (Apache-2.0), the Juno-106
Ultramaster KR-106 (GPL-3.0), the TB-303 Open303 (MIT), the replay IBXM (BSD-3-Clause). The package carries three
files of JieLi's AC79 SDK (Apache-2.0). The FM-1's screen draws Terminus (SIL OFL 1.1). Each work on the demo
disk carries its own licence, in its credits above. No warranty.