Ranked in these QuestionsQuestion Ranking
Pro Cross platform
Supports Linux, Windows and Mac.
Pro Polished GUI
The gui looks great and is easy to use.
Pro Open source
Free to use and modify. Apache license. Repository link: https://github.com/resin-io/etcher
Pro Relatively fast
Flashes/burns images relatively fast.
Con Runs hot
Heats up USB to levels nearing shut down with USB 3.0.