Excalidraw is an open-source whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them. Available directly online as a web app and also through CodeSandbox to easily see how the code works, and the app is available for self-hosting.
Simple, easy, no signup need whiteboard program
At Yahoo! Finance, you get free stock quotes, up to date news, portfolio management resources, international market data, message boards, and mortgage rates that help you manage your financial life.
Best portfolio track tool
Web-based Git hosting service facilitating collaboration, with features like issue tracking, social networking, and wikis for project management.
Code
A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.
Coding challenges
Streamline teamwork with real-time collaboration, drag-and-drop content organization, and visual simplicity across notes, tasks, wikis, and databases.
Note taking
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