FGSL Views 4 meanings found FGSL most often denotes the Foothill Girls Softball League, a youth sports organization. The acronym is also used for a Brazilian free‑software forum, a regional island reference, and as a personal name abbreviation. Miscellaneous Flávio Gomes da Silva Lisboa Community Fórum Goiano de Software Livre Regional Malabo-Macias Island, Equatorial Guinea Sports Foothill Girls Softball League