zk is described as 'Plain text note-taking assistant meant for use alongside a separate text editor program' and is an app in the education & reference category. There are more than 25 alternatives to zk for a variety of platforms, including Mac, Linux, Windows, Self-Hosted and Android apps. The best zk alternative is Obsidian, which is free. Other great apps like zk are Logseq, Notesnook, Zettlr and Zim.
Dendron is an open-source, local-first, markdown-based, note-taking tool built on top of VSCode. It supports all the usual features you would expect like tagging, backlinks, a graph view, split panes, and so forth.
Flexible note-taking and writing tool featuring advanced markdown with in-line images, cross-note links, live preview, hashtags, Focus Mode, plain text storage, iCloud sync, one-tap formatting, smart data recognition, and multiple export formats for portability.
As easy to use as a word document or bulleted list, and as powerful for finding, collecting, and connecting related ideas as a graph database. Collaborate with others in real time, or store all your data locally.
Silver Bullet is an extensible, open source, personal knowledge management system. Indeed, that’s fancy talk for “a note-taking app with links.” However, Silver Bullet goes a bit beyond just that.
TiddlyRoam is your open source external brain. TiddlyRoam allows you to quickly create your own wiki. You can add fragments of thoughts and findings whenever they come to you. TiddlyRoam will link them and help you spot the patterns.
CLI and local web plain text note-taking, bookmarking, and archiving with linking, tagging, filtering, search, Git versioning & syncing, Pandoc conversion, + more, in a single portable script.
Zettel notes provides seamless private zettelkasten and markdown note taking experience with synchronization. It is provided free of cost, without ads and with no hidden permissions. No user data is collected.
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This is what I personally use in place of zk on mobile. It's missing its own in-built ability to generate random note IDs (if that's what kind of ID you use) but it otherwise does things like let you link between notes by ID instead of just filename.