You're right, there is overlap in the sense that both Dendron and Foam are open source note taking tools based around vscode and markdown. Dendron differs in our focus on structure - while we support backlinks, wikilinks, and tags, the primary way of navigating notes in Dendron is by hierarchy which can be described by schemas (our type system for note hierarchies). We provide extensive tooling around traversing and manipulating this structure (lookup, refactoring, etc)

For a more detailed breakdown, you can see the foam vs dendron page here -> https://wiki.dendron.so/notes/p5fMTi-6zOyX1TwhL6dM0.html