A popular free alternative is the Just T4 Soundfont by Milton Paredes. It is a dedicated Yamaha Tyros 4 GM set that is often compared to or confused with Black Tyros but is explicitly released for free.
Because the original Black Tyros GM was a commercial release, finding a legitimate "free" download can be difficult. However, there are several community-driven alternatives and archives where users share similar high-quality Tyros-based sets: Black Tyros Gm Soundfont Free Download
Typically distributed in SF2 (SoundFont 2) format, making it compatible with most modern Digital Audio Workstations (DAWs) and MIDI players. Finding a "Free Download" A popular free alternative is the Just T4