Lucid 3-D[1] was a spreadsheet package that began in the MS-DOS era;[2] Windows support came later.
[3][4] Sam Redman[5] and Michael Stanford[6] incorporated as PCSG corporation (Portable Computer Support Group).
[7] Their Lucid 3-D spreadsheet was marketed by Dac Software of Dallas, Texas.
[8] Lucid 3-D was considered noteworthy at the time for being "the only major memory-resident spreadsheet available for the PC".
[1] Data files were stored using the extension ".lcw" (Dot LCW).