Dockdrop!

ShareX is a free and open source program that lets you capture or record any area of your screen and share it with a single press of a key. It also allows uploading images, text or other types of files to over 80 supported destinations you can choose from.

Droplr is a tiny application that aims at helping people share things easier. Every day people come across many situations in which they need to share something with someone else. It's a simple problem, but almost every solution is limited, cumbersome, inflexible and/or confusing. Droplr aims to solve this problem by focusing on simplicity, ease of use and flexibility.

Yoink simplifies drag and drop between windows, apps, spaces and fullscreen apps.

KShare is a screenshotting utility built using Qt and written in C++. It has many features, including:

Drag a file onto the dock icon and your fully customizable grid of destinations flies smoothly out using core animation.

Your screenshots are automatically uploaded on your web storage.The URL is in the pasteboard when the upload is finished. / FileShuttle support FTP and SFTP protocols to upload your files on your own web storage. / Drop a file on the dock icon to upload the file and get the URL in the pasteboard. You can even drop text from any application, FileShuttle will create a text file and upload it. / When you drop more than one file on FileShuttle, a ZIP file is created on the fly and then uploaded on your web storage. »

Liszt is a simple app for in your menu bar. When you drop an image on it, it uploads the image to your FTP server. The public link to the image is copied to your pasteboard in Markdown code. This saves you a lot of hassle when you are working on your text.

Over the internet, or even a local network, sending files to other computers can be a pain. Papaya solves this problem. Drop a file or folder onto Papaya, and you get back an address through which others can access that item.

NoCap makes sharing your files and screenshots fast easy.

Swiftdrop is a small, non-intrusive utility application which loves to live in a user's Dock, or in the system menu next to the clock. When files or folders are dropped on the icon, they are uploaded to the public folder of the user's Dropbox account, or a Swiftdrop folder on the user's Google Drive account, whichever the user chooses to use. When the upload is complete, a publicly accessible URL pointing to the file is placed in the pasteboard, for easy sharing on the web, instant messaging etc. »