The best alternatives to Catcode are Clipdrop, ClipDrop, and Papertag. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Capture and transfer anything around you! (objects, people, drawings, and text) ClipDrop (AR Copy Paste) is now available on Android, iOS, macOS, and Windows.
A Papertag is a four digits code that can be connected with any digital content. Use it to enrich your paper notes with text, links, photo, video, etc. It works like a bookmark. First, create it, then search it and see what's attached.
OntoCraft – A tool that helps data producers to build data ontologies that depicts a semantic data model. This is then annotated and tagged with business glossaries at a column and table level to be entitled in OntoSphere.