I agree that spending time on tagging/categorizing everything is not worthwhile, I tried doing that for my Firefox bookmarks/Zotero, and ended up abandoning it

I agree that spending time on tagging/categorizing everything is not worthwhile, I tried doing that for my Firefox bookmarks/Zotero, and ended up abandoning it in favour of search. Having said that it is useful to have a limited number of temporary categories: - things I want to (re)read next - "best" / "mind-blowing" technologies, usually built around a simple, minimalistic, but powerful concept (e.g. reagents for composable lock-free data structures, parallel prefix sum, Futamura projections, etc) For everything else full-text search in Zotero has served me well. About portability between tools I would go with Pandoc, it supports conversion between a number of Wiki formats and markdown, which should suffice for most purposes. Definitely avoid tools that lock you in their proprietary formats.