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Depending on what you use ShareX for, Mac2Imgur could be useful for you.

This is really good! Just had to turn off banner notifications and it matches all the functionality and simplicity I need. Would love to see someone add ShareX's magnifying glass & crosshairs

Try Gyazo (https://gyazo.com/), which supports Mac/Windows/Linux.

Last time I tried Gyazo, the free tier didn't support direct url clipboarding, just a link to a page with more ads than content.

Dropbox lets you get a link right away. But only for screenshots. Screencasts you need to use itunes then copy the file to dropbox, but it is fairly easy too. Just not one click.

http://8px.co/

Evernote Skitch works super