draw.io - Online diagramming application
Othello - Othello is a Puzzle, Board, Single and Multiplayer video game in which the main task of the player increases his marbles in order to win the game.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Puzzle Strike - Puzzle Strike is a Puzzle, Board, Single and Multiplayer video game created and published by Sirlin Games.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Streets of Chaos - Streets of Chaos is a Puzzle, Tactical, Turn-based Strategy and Single-player Simulation created by SimProse Studios.