My Cryptocurrency Dashboard is a single html file webapplication (dependencies: JQuery, JQuery Mobile, Underscore.js). You can host it or use it from a local storage on your PC or other device.
Data it stored loacally in the browser and never leaves your device. External crypto currency data is retrieved form coinmarketcap.com.
Source is here
If You feel like donating then please consider a donation to coinmarketcap.com, without their API this application would not be possible. After that you can buy me a beer: BTC: 1M6uGrB9Mesm3gGhEjCT1MK1azn16pVxs3 ETH: 0x6d22adF55901C0482f5c5406dA665b3A4eF0adb4