I've developed a set of UNIX-philosophy CLI utilities for managing your zettelkasten, a C++ library (used by the utilities) and a set of shell scripts that makes the whole thing easy to use for the terminal-savvy. The fzf-based finder (script) integrates with Vim. It's probably the fastest set of zettelkasten utilities. Heavily inspired by sirupsen/zk, but faster, more powerful and more consistent interface.
utilities + lib: https://gitlab.com/andrejr/zetk shell wrappers: https://gitlab.com/andrejr/zetk_fzf
Shared under AGPL3.