ForSCAN is awesome but it's an orthogonal conversation since it's a reverse engineered diagnostic tool rather than a first-party one. If we expand the conversation to that space there are tons of options with varying capabilities depending on manufacturer, including also pirating the OEM tools directly. Also worth noting that ForSCAN also doesn't _quite_ support all common operations, for example Remote Keyless Entry enrollment on newer BCMs with push-to-start needs FDRS still.