Add entry for GrandPerspective (#1287)

Author: erwinbonsma

README.md

@@ -1089,6 +1089,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
 * [coconutBattery](https://www.coconut-flavour.com/coconutbattery/) - Shows live information about the battery in your Mac. Includes: manufacture date, capacity, cycle count, battery status, temperature, discharging power.
 * [DaisyDisk](https://daisydiskapp.com/) - Gives a great overview of disk usage. Can also make more disk-space available by cleaning up your disk.
 * [gfxCardStatus](https://gfx.io/) - Unobtrusive menu bar app for OS X that allows MacBook Pro users to see which apps are affecting their battery life by using the more power-hungry graphics. ![Freeware][Freeware Icon]
+* [GrandPerspective](https://grandperspectiv.sourceforge.net) - A small utility that visualizes disk usage by way of tree maps. It lets you quickly spot which files and folders take up the most space. [![Open-Source Software][OSS Icon]](https://git.code.sf.net/p/grandperspectiv/source) [![Freeware][Freeware Icon]](https://sourceforge.net/projects/grandperspectiv/files/grandperspective/) [![App Store][app-store Icon]](https://itunes.apple.com/us/app/grandperspective/id1111570163)
 * [Gray](https://github.com/zenangst/Gray) - Pick between the light appearance and the dark appearance on a per-app basis with the click of a button. ![Freeware][Freeware Icon] [![Open-Source Software][OSS Icon]](https://github.com/zenangst/Gray)
 * [HandShaker](http://www.smartisan.com/apps/handshaker) -  Mac on the management of Android mobile phone content. ![Freeware][Freeware Icon]
 * [iStat Menus](https://bjango.com/mac/istatmenus/) - Advanced Mac system monitor on the menubar.