ShareX

ShareX is basically a greenshot image editor with a backend interface that supports gifs and advanced image host options

I've tried almost every other similar program recommended on "alternatives" and shareX is by far vastly superior to anything out there

only for windows though

EDIT As of November 29th 2017 the best version is 11.6, anything past that isn't greenshot editor its shareX image editor.

EDIT^2

ShareX is good as a universal Lazy Uploader. If you ever get asked to upload something, just dump an image URL generated by shareX like so:

Works on everything, same number of steps everytime. No need to dig around for local file paths. Useful for adding images and gifs to alternativeto.com, stackoverflow, fiverr, wordpress, any internet site, any windows desktop application, etc etc. Just find some image on your screen, crop/annotate/upload, paste URL in any file uploader.

Imgur works best as an image host, if you want more security look into amazons3

[Edited by Kagerjay, November 29]

I used this app for about 3 months. I had been using Greenshot which lacks a scrolling capture capability. ShareX has scrolling capture, and so much more.

However I ultimately decided to go back to Greenshot for all my needs and use ShareX for those few times I require a scrolling screen cap.

The primary reason - er, actually, the only reason - is that ShareX's settings are overly complex (IMHO). I use multiple devices and need to install (and configure and maintain) most of the same apps across all of them. I found it very challenging to recall how to set my favorite customizations each time I install the app on a new device.

... of course, I could create my own cheat-sheet with notes about how I prefer to configure this app. In fact, I even started doing just that. But I found my notes to be incorrect about many of ShareX's features. After 3 months of very regular use (I take screenshots to document my work on a daily basis) - I still could not reliably remember the basic procedures to configure and use this app.

I realized either I was feeble minded, or the app was too complex. I am prepared to argue the latter is much closer to reality than the former (my wife is equally prepared to argue the opposite)

Ultimately, I decided this app will not be my one-and-only screencap app. Its configuration is overly complex, especially for a user who owns many devices and does not have the time or patience to keep relearning how to tweak all desired user-custumizations.

I consider myself a power user on both Windows and Linux. I couldn't venture to guess the number of apps I use on a daily basis - it certainly is in the dozens, and, over time, I've become a power user of countless apps of various types.

The usage of this app, once it is set up the way you desire, is quite simple, intuitive and feature-rich. Its biggest challenge is to make configuration and tweaking much more straightforward for the user.