Àmì Plugin: revcanonical
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Shorter Links
Override the default WordPress "shortlink" URL with one that has a custom text in it. You can also set a different base URL.
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RevCanonical
A Wordpress plugin that creates and adds support for shortened urls plus the shortlink auto-discovery tag
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ShortURL
The ShortURL plugin provides short canonical permalinks to your posts and pages similarly to WordPress.com via its WP.me service.