Don't have so much free space anymore, but you don't have any ideas why? SD Maid could help you! It scanns you Android complete for useless Data and Apps which left some Files. At least, you can more than a couple of Gbytes back :)
Screw thw Quick Toolbar and you need much more? Then use Notification Toggle. It will create an small Line in you Notifications to show the Options like WLAN, BT, start Opera and much more. Better, faster and more power than the old thing.
Staying somewhere and need GPS but you don't get any signal? This app might help you. It analyze any GPS-Satellite above you and show them on a Radar. Also good feature, it shows you compass, so you can also travel without navigation
Wanna send your Friends some HUGE files, but Bluetooth need a couple of Hours? Why not sending the files with WIFI? Superbeam is the Solution. Create a Hotspot, join, select the file with you Explorer and send them with Superbeam.
Your Friend need some Files in spezific Path or you want to steal some files. Then you should use THIS app. A fully Bluetooth Manager, which allows you, to download AND upload any files on the phone of your Friends. Simple, easy, clever