Here is a productivity application for macOS, which shows everything like news, RSS feed, API, price tracker, stocks, by plugins.
Numi. Beautiful calculator
Beautiful calculator for Mac that blends math with text. Currency, units, time zones, numeral systems, variables, export, notification widget.
By slide in and slide out, Slidepad brings iPad style multitasking to your Mac. Using Slidepad is as easy as using your dock.