SSI is most famous for publishing a range of Dungeons & Dragons based RPGs, including the "Gold Box" games in the early PC days. After being acquired by several companies, the brand was retired sometime after it was acquired by Ubi Soft in 2001.
Strategic Simulations, Inc's Mobygames page
Strategic Simulations, Inc's Wikipedia page
Games developed and/or published by Strategic Simulations, Inc
Dungeon Hack (1993)