📝 This plugin for TiddlyWiki 2.x shows when there are unsaved changes or (optionally) tiddlers opened for editing.

When unsaved, marks "save" button bold red (by default; styles can be adjusted via StyleSheetUnsaved) and adds a leading * to the document title.

🛍️ Available to install via ExtensionsExplorerPlugin, like many others (to find it, install the central collection and YLExtensionsCollection from it).