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 (Portable Computer Support Group).
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."italicized is the heading of pages 2 & 3 of a four page ad published September 1988.
Another technical feature was what their ads called "not only minimal recalc, but background recalc".PC Magazine, September 29, 1987 page 29
Lucid 3-D was included in advanced personal organizers, such as in Casio SF-R20.
The Windows versions could display "up to nine overlapping spreadsheet windows".
File extension Data files were stored using the extension ".lcw" (Dot LCW).
References