Permalink Manager is the most convenient way to alter your URLs without touching any core files. You may use it to remove rewrite slugs or add custom fields to permalinks.
Peeklink - Customized Link Previews for 🔥 Posts
Linktree - Connect your audience to all of your content with just one link.
Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
Lnk.Bio - Life's a link
Peekalink - An API to magically preview any link ✨
many.link - Add as many links in your Instagram bio as you want