GNU Oleo

The project was started in 1992 by Tom Lord,[1] and became part of the GNU initiative around 1994.[5] At the time, the only open source alternative was the older text-based sc, both products having similar functionality to early versions of Lotus 1-2-3 or Microsoft Excel. Oleo's key bindings however were inspired from the Unix world, and similar to those used by the emacs editor, which frustrated novice users familiar with the DOS counterparts.[6] Oleo and sc were the first Unix spreadsheet applications to acquire a graphical user interface.[7] Because Oleo was officially part of the GNU project, it was dubbed "GNU's response to Excel" in a 1996 article in iX magazine.[8] It claimed to be "better than the high priced spread",[9] a reference to old oleomargarine advertisements promoting margarine over the more expensive butter. Oleo also worked well in a BSD environment; a FreeBSD port was available.[5]

By 1995, sc had acquired an X Window front-end called xspread, which added graphics capabilities.[6] In 1998,[1] Oleo acquired a Motif-like GUI, relying on the royalty-free LessTif widget set. A GTK version was also under development. By 1999 Oleo was still judged as "not completely usable",[10] due to the awkward graphical interface lacking in user friendliness like X-style cut, copy, and paste or tear-off menus.[7] In the 1995 version, to type a number into a cell the user had to hit the "=" key first, similar to the early versions of Excel.[6] This was later changed to typing a number directly, although typing a number in a cell that already contains one appends to it rather than overwrite it.[11] Graphics are drawn using the device-independent library libplot, the centerpiece of the GNU plotutils. Oleo offers spreadsheet access to the GNU Scientific Library, a large collection of mathematical functions. It also offers some database connectivity, allowing access to MySQL database via queries, Xbase and DBF file access.[5] It has support for macro programming, and for printing purposes it supports ASCII and PostScript output.[12] Still, by 2000 it could not import Excel spreadsheets, while newer open source alternatives like Gnumeric offered this feature,[5] and could also import Oleo spreadsheets.[13]

Oleo was still recommended as a console spreadsheet application in a 2005 article in Linux.com, but the reviewer warns that "I had expected Oleo to be more intuitive, but I needed multiple sessions with the info file before I could use it proficiently. Even cell reference syntax was not what I had expected."[12] By default, Oleo uses numbers for both rows and columns; a cell reference uses a syntax like r12c26.[11] A single Oleo process does not support the display of more than one file at a time, but GNU screen or multiple terminals can be used as a work-around. Oleo supports editing the same spreadsheet in concurrent application instances.[12]

• GNU Oleo Home Page