PostWarden is a full-featured desktop Tumblr client for OS X with support for local drafts, editing past posts, and working offline.
The app also maintains a full backup of your Tumblr blog(s), storing posts as plain text files in YAML format, which opens up all sorts of interesting possibilities.
The only thing that’s missing—and, to be fair, it’s missing from every Tumblr client I’ve tried—is an option to schedule posts.
Via Minimal Mac.
I’m sure many of you need this.