Not modern but there's the GW-Basic clone[0] (x-platform, actively developed). Also, the docs[1] are incredible: [0] http://robhagemans.github.io/pcbasic/ http

Not modern but there's the GW-Basic clone[0] (x-platform, actively developed). Also, the docs[1] are incredible: [0] http://robhagemans.github.io/pcbasic/ http://robhagemans.github.io/pcbasic/ [1] http://robhagemans.github.io/pcbasic/doc/ http://robhagemans.github.io/pcbasic/doc/