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draw.io - Online diagramming application
globalquiz.org - Difficult, multiplayer and multi-language trivia 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.
HugeQuiz - test your knowledge with a variety of quizzes about everything.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
JetPunk - JetPunk is the biggest online quiz platform that contains sports, geography, music, movies, and more regional or international information and database, created by H Brothers Inc.