What are some alternatives?
When comparing snaggy and Gyazo, you can also consider the following products
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
LightShot - The fastest way to take a customizable screenshot.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Snagit - Screen Capture Software for Windows and Mac
LICEcap - A straightforward, high performance application that enables users to capture a portion of the desktop and save it to . GIF or . LCF, LICEcap is available for download as a GPL free software.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.