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Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Pennywise - Cross-platform application to open any website or media in a floating window
PiPifier - PiPifier is a macOS 10.
ZoomIt - Presentation utility for zooming and drawing on the screen.
X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.
PiP-Tool - PiP tool is a software to use the Picture in Picture mode on Windows.