Sudokuki is a graphical SUDOKU game. It solves even the most difficult sudoku grids for you. It can generate a sudoku, play sudoku, and print a sudoku.
LibreOffice is a feature-packed and mature desktop productivity package. It consists of a word processor, a spreadsheet, a presentation package, a drawing program, a database, and an equation editor.
A semantic content management framework.
An issue tracking and team collaboration system.