docs: add a "Related Work" section to README

README.md

@@ -125,3 +125,9 @@ email = "martinvonz@google.com"
 
 The best way to get started is probably to go through
 [the tutorial](docs/tutorial.md).
+
+
+## Related work
+
+There are several tools trying to solve similar problems as Jujutsu. See
+[related work](docs/related_work.md) for details.

docs/related_work.md

@@ -0,0 +1,17 @@
+# Related work
+
+Similar tools:
+
+* [git-branchless](https://github.com/arxanas/git-branchless): Helps you use a
+  branchless workflow in your Git repo. Supports anonymous branching, undo,
+  and faster rebase (`git move`). Under heavy development and quickly gaining
+  new features.
+* [GitUp](https://gitup.co/): A Mac-only GUI for Git. Like Jujutsu, supports
+  undo and restoring the repo to an earlier snapshot. Backed by its
+  [GitUpKit library](https://github.com/git-up/GitUp#gitupkit).
+* [Gitless](https://gitless.com/): Another attempt at providing a simpler
+  interface for Git. Like Jujutsu, does not have an "index"/"staging area"
+  concept. Also doesn't move the working copy changes between branches (which
+  we do simply as a consequence of making the working copy a commit).
+* [Pijul](https://pijul.org/): Architecturally quite different from Jujutsu,
+  but its "first-class conflicts" feature seems quite similar to ours.