GIMP

Gimp
Gimp
Gimp

This is an image editing software to create new pictures and edit existing ones. Typical uses for GIMP include creating graphics and logos, resizing and cropping photos, changing colours, combining images, removing unwanted image features, and converting between different image formats. GIMP can also be used to create animated images and prepare images for websites. It has similar capabilities to popular image editors like Adobe Photoshop, but has the advantage of being free and open source. GIMP works on all common computer operating systems and has been translated into many languages.

It's useful because

it makes it easy to resize and edit pictures and photos for websites and posters.

But watch out for

the need to learn a lot about digital image authoring to create something new yourself.

Learning curve:
Steep
How can you use it?
Desktop installation
Languages:
Arabic, Chinese, English, French, Russian and Spanish

things

How do you make things with it?
Download and install GIMP on your computer. It can open most types of image file.
Things you can make:
Image editor

privacy

Privacy and Portability
Everything you create in GIMP is yours and can saved on your computer. GIMP can load and export most common image formats. It’s difficult to exchange editable files between GIMP and Adobe Photoshop, which can be a problem when collaborating for example with designers not using GIMP.
How do you get data into it?
GIF, IPS, JPEG, JPG, PNG, PSD and SVG
How do you get data out of it?
GIF, IPS, JPEG, JPG, PNG, PSD and SVG
How is it licensed?
GNU GPL