Sharing picture across the internet could be a real problem sometimes. Not because there's a lack of tools to do it, no - that is the real problem: there are too many apps that enable you to take a screenshot and upload it somewhere, and people don't know anymore which app to use. We reviewed apps such as Tinygrab and Droplr before, but the one we're talking about today is quite awesome and surely different from those ones.
Scrup by Rasmus Andersson (designer at Spotify) is simple and open source utility that, once installed and running on your Mac, can upload screenshots to your own webserver and automatically paste the url into the clipboard for easy sharing. You just have to upload a .php file to your server, insert some credentials in the Preferences of the app and you'll be all set. Scrup runs in the menubar, it shows nice thumbnail previews of your "scrups" together with date and time.
It works just as good as many other paid and famous apps. Scrup is free and available over at GitHub's official project page here. Also, be sure to check out Django Scrup, a django-based web receiver for Scrup that forwards the screenshots to Amazon S3.