PageStream (originally Publishing Partner) is a desktop publishing software package by Grasshopper LLC (United States) currently available for a variety of operating systems including Windows, Linux, and macOS.

[1][2][3] Publishing Partner 1.5 was released for the Atari ST and Commodore Amiga platform in 1989.

Publishing Partner Professional 2.0, renamed to PageStream 2.0, was released for the Amiga in 1990 and Atari ST in 1991.

The application was entirely rewritten with a new user interface and many new features including colour separations, table of contents, index, nested chapters, Bézier curves, horizontal and vertical multi-page spreads, drop caps, hanging punctuation, Pantone colors, auto-kerning, auto-hyphenation, and ARexx scripting support.

[12] PageStream 3.3 was released for Amiga and Macintosh in 1997 with new fly-out tools for shapes, grids, and notes, as well as RTF export, a character panel, and improved chapter support.