HoDoKu - HoDoKu is a sudoku helper written in Java and available in English and German.
World of Solitaire - Over 50 beautiful free web based Solitaire games. Klondike, Spider, FreeCell and more.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
BVS Solitaire Collection - Award winning collection of solitaire card games for Windows/macOS and iPad/iPhone.
nsudoku - A Sudoku game made with ncurses.
PySolFC - PySolFC is a collection of more than 1000 solitaire card games. It is a fork of PySol Solitaire.