Cologo is collaborative web-based programming environment. Cologo's most likely uses are education and experimentation, but its features are amenable to a variety of uses.

Cologo programs are written in Google Spreadsheets, and multiple people can collaborate over the web to write and edit code and documentation. A spreadsheet can include procedure definitions, comments, formatted text, and data used by the program, all in one sheet. Users can collaborate on data sets as well as programs.

The runtime environment is a Gadget, configured to use a spreadsheet-like data source for the program code. The gadget is typically inserted onto the Google Spreadsheet containing the program, but it can also be added to a iGoogle page, any web page, or any compatible gadget container. The Gadget can use any data source compatible with the Google Visualizations API. Google Spreadsheets provides collaborative editing, and updates the gadget with changes in real-time.

The programming language is a faithful variant of Logo, including turtle graphics. Cologo uses slightly different syntax than traditional Logo to make the best use of the spreadsheet layout for programs. The Cologo interpreter can be paused and resumed for inspection of variables and debugging.

The Cologo engine is implemented entirely in web browser JavaScript, using the Gadget and Google Visualization APIs. The turtle graphics system uses the HTML 5 canvas feature supported by Firefox, Safari, and Opera, and works with Internet Explorer using an HTML canvas plugin. Cologo can be used in a browser without canvas support with the turtle features disabled.

This Google Code project is for the development of the Cologo runtime environment, gadget and language. For more information on using Cologo, visit the Cologo website: http://www.cologo-lang.org/