Betula is a free self-hosted single-user bookmarking software for the independent web. Use it to organize references or maintain a linklog.

Features
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Publish bookmarks, along with optional title and description formatted with Mycomarkup.
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Add tags to your bookmarks.
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Posts can be public or private. Share only what you want to share!
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Simple user interface that does not require JavaScript.
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If you have JavaScript, you can use tag autocompletion.
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The whole collection is saved as a single SQLite file.
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IndieWeb microformats are produced.
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Simple installation: the program is one binary, the collection is one file, all configuration is done through the web interface.
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Bookmarklet.
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Built-in documentation.
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Searching.
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ActivityPub-backed federation (experimental).