Swift Calc 128 is a powerful, easy-to-use electronic spreadsheet for the Commodore 128.  Included with this program is SIDEWAYS which lets you print your documents in landscape.  Click here for the manual.

SwiftSheet (Also called Swiftcalc) 128 by Cosmi - Swlftcalc replaces pencil, pad of paper and the modern calculator with its electronic worksheet.

Link - Manual

Turbo Calc 128 by Gregory R. Schmalhofer for the Commodore 128 (80 column mode) is a spreadsheet application from 1988.  Published by Softdisk, Turbo Calc appeared in volume 2, issue 3 of the UpTime disk magazine.  Full help is included in the program.

You can find a nice review of this software at the "I Still Adore My 64 & 128" website.