from the you-can-grep-a-dead-tree-treesheet dept.
Aardappel writes "TreeSheets has been available as freeware for Windows / Linux / OS X since 2008, but is now also Open Source (ZLIB license). TreeSheets is a cross between a spreadsheet (you can create grids) and an outliner (you can create grids inside grids) allowing you to create almost any structure to organize your data in."
"The fundamental principle of science, the definition almost, is this: the
sole test of the validity of any idea is experiment."
-- Richard P. Feynman