Papertop
An OS-like workspace in a browser tab: windows, a dock, files, widgets and about 50 apps and games. Everything you make stays in your browser, with no account.
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Apps include Files, Notes, Tasks, Calendar, Sheets, Write, Slides, Whiteboard, Photos, Music, Radio, Maps, Weather, Wiki, Paint, Piano, a code editor (PtCode) and a Terminal; games include Chess, Solitaire, Mahjong, Sudoku, Minesweeper, Nonogram, Word Dice and more.
Made in OSW Studio (oswstudio.com). MIT License. README.md, NOTICES.md and llms.txt at this site's root describe it in full.