microsoft.com
Microsoft Journal helps clean, compare, sort, transform, count, or format text in the browser.
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write.as
Write.as is a pared-down blogging platform focused on writing rather than content management, with a Markdown or Rich Text editor. Posts can reach readers in the browser, by email or RSS, on e-readers, and on federated platforms such as Mastodon. A paid Pro plan costs $6 per month, billed yearly.
github.com
Chronicler is a free, offline worldbuilding tool and local wiki for writers, game masters, and tabletop RPG creators. It saves notes as plain Markdown files on the user's computer and is source-available rather than open-source. It runs 100% offline with no sign-up, subscription, or cloud storage.