Collette Utilities for GEOS and the Commodore 64, is likely one of the best collection of useful utility programs you'll find, all on one double sided floppy disk.  Each utility comes with full docs in geoWrite format.  Here's an overview:

• Font Editor 2.5 - create standard, MEGA and Perfect Print fonts
• Font Changer - change fonts and point sizes in geoWrite documents
• geoWizard - run one GEOS program without closing the one already in use
• geoWizDump - screen dumper for use with geoWizard
• MiniDesk - Desk Accessory (DA) for copying and deleting files
• Select Printer - Desk Accessory (DA) for changing printer drivers
• DOS_Wedge - Desk Accessory (DA) for sending commands to disk drives
• AutoAlbumAdd - Desk Accessory (DA) for eaiser handling of Photo Scraps
• PS. Processor - create customized PostScript output
• PS. Patch(disk) - patch geoPubLaser for disk output
• PS. Patch(GC) - patch geoPubLaser for geoCable output
• LaserWrtr 2.1 GC - geoCable version of LaserWriter Printer Driver