Information Week shares 11 apps for Windows 10.  Most are free and the other products may be purchased for low cost.  “Microsoft Calculator” and “VLC Player” and “I Heart Radio” are all excellent additions that I would recommend

http://www.informationweek.com/software/operating-systems/11-windows-10-apps-for-your-upgraded-pc/d/d-id/1321895

Ever since it first unveiled Windows 10 earlier this year, Microsoft has emphasized the new Windows Store and Universal Apps platform as core components of its new OS.  Apps give life to our smartphones, tablets, and PCs. We use apps to talk, text, email, work, stay organized, play games, and listen to music. Windows 10 may run well on your PC, but it won’t reach its full potential without apps.  The universal apps approach is designed to simplify things for developers and customers. Developers can use mostly the same code base for smartphone and tablet apps. Consumers only have to download an app once to have it on all their devices.