It has been a while since Apple added anything major to OS X, but you can instantly upgrade your Mac with these great apps. Through 9to5Toys Specials, you can currently grab mind-mapping tool Scapple for $9, music converter STAMP Premium for $5, and the intuitive sticky notes of Ghostnote for $7.

Rated 4.5 out of 5 stars in the App Store, Scapple is the ideal workflow for organizing your thoughts. You can quickly note down ideas by double-clicking anywhere on the canvas, before tracing lines to join them up. Notes can be grouped together in shapes, and the app offers nice sharing features. Download it now to save 40% on the regular price.

STAMP Premium (pictured, top) lets you transfer your carefully curated music playlists between Spotify, Apple Music, Google Play, Rdio, YouTube, and Deezer. You can also import CSV lists, and the app will track down each song automatically. Save yourself hours by downloading this app now at half price.

Unlike the Stickies app on OS X, Ghostnote for Mac lets you contextualize notes by linking them with files or apps. Described as “amazingly useful” by Lifehacker, Ghostnote also lets you set up keyboard shortcuts, run your own scripts, and export notes as RTF files. Get it now to save 30% on the usual price.