GIMP

Pros

Gimp is an open-source image manipulation program what means it is absolutely free to use. Also, you will receive regular updates which add new features and fixes bugs including security issues. It has all the abilities that for example Adobe Photoshop and other commercial programs have. It can offer even more because it is easily extensible and flexible for every environment with lots of great community plugins and scripts.

Cons

The user interface of Gimp is not the most beautiful one but its function is very good. It has a lot of menus and submenus so for beginners it may be a little harder to achieve some more complex operations such as retouch of a face or double exposure. Also, compatibility with Adobe file formats exists but don't except that it works perfectly. Most of the time it works flawlessly if you are opening the document from older versions of Photoshop because newer version needs some updating and updates occur approximately every 2 months which is still faster than what Adobe is doing with their Photoshop.

Pros

Gimp is a great entry-level software for users that are just getting into things like photo-editing and photo manipulation. It has multiple tools that the user needs to edit photos. For example, a user can use this software to color correct a photograph. If a user wants to get into photo-editing but doesn't want to spend the money to use higher-end software, this is a great place to start.

Cons

One con is that it doesn't have the exact same tools as a software such a photoshop. There also would a learning curve when switching to a higher-end software because even though a lot of the tools do the same things, they'll have different icons and different placements. The user is also limited to what they can exactly do. The software is designed to do basic tasks.

Pros

The best part which I love about it is that it is open source software. It gives a very good satisfaction and gives a way for other also to improve it.
The other best part which I love about it is its price(FREE) . This removes the barrier for many newbies.
Other than that the features which I really appreciate about it is frequent update cycles,huge community and options of adding plugins and scripts ( many users donate it for free for other users)

Cons

1.) UI in my opinion is quite old fashioned.
2.) It takes more clicks to achieve the same goal as compared to other rivals like Photoshop
3.) It's compatibility with other software is not so smooth ( this experience may differ from user to user)
4.) It had been quite a time since it was released but still it has failed to make an impact on commercial space ( take the example of blender:- it has acquired attention of many big players in the market)
5.) Performance ( bigger files):- I have noticed that photoshop is much more better in managing bigger project as compared to gimp (not a huge difference but still)

Pros

For most everyone in the photography world, GIMP is an obvious go to for free editing software. For a long time, before Adobe had created the cloud, it was the only real affordable way to edit images. The universal OS deployment is also a huge plus! With adobe you're stuck with windows or Mac, but with Gimp you can use it on a linux machine! This in itself is why GIMP is still in the running and consideration for a Photoshop alternative photo editing software.

Cons

The first and most obvious is the strange and un-user-friendly graphical user interface (GUI). The GUI tends to be spread out, and it has no background window frame, so your windows desktop peeks through around all of the edges. To me this is a huge con, because as I am editing I want a high contrast single color background that doesn't distract me from my work. Some may say, then make your desktop background black, and yes this is an alternative, but it is an unnecessary step, that the software engineers and developers can easily remedy.

Pros

It is a GNU Image Manipulation Program which helps in editing images. It is available for OS X, Linux, Windows and other operating systems. It provides various tools for illustrators, graphic designers, photographers and many other professionals. It has various third party plugins which help in enhancing productivity. Its various tools help in the manipulation of high-quality images. It helps to produce graphical design elements, icons, logos and other artworks.

Cons

Some of its features need to be more intuitive. It has limited options to develop 3D designs; there must be more helpful options. It will take some time in downloading fonts. As compared to Photoshop it has fewer features. Its scripting may be difficult to use if you do not have any experience. It has various menus, submenus and functions which are complex and may be difficult for beginners.