Logseq is a versatile knowledge platform with the support for Markdown and Org-mode. You can create tasks, manage notes, and do a lot more things with them. It also has the ability to install various 3rd party plugins from its marketplace.
I like the cross-platform functionality, as well as its compatibility with using an open standard like Markdown. The knowledge graph is also quite unique amongst basic note editors. It did open and edit all my existing QOwnNotes notes, but on the whole I still prefer to use QOwnNotes because it has more menu options for text formatting and marking code snippets.
See https://itsfoss.com/logseq/
#technology #opensource #crossplatform #notes #tasks