Lucid 3-D
Lucid 3-D was a spreadsheet package that began in the MS-DOS era; Windows support came later.
History
Sam Redman and Michael Stanford incorporated as PCSG corporation.Their Lucid 3-D spreadsheet was marketed by Dac Software of Dallas, Texas.
Features
Lucid 3-D was considered noteworthy at the time for being "the only major memory-resident spreadsheet available for the PC".The selling point of the product was being "three dimensional. Any cell of the spreadsheet can contain a complete other spreadsheet that you can access with a single keystroke."
Another technical feature was what their ads called "not only minimal recalc, but background recalc".
The Windows versions could display "up to nine overlapping spreadsheet windows".