GIMP

If you like professional image editing or if you're a fan of Photoshop, this software's for you! 

GIMP is a free and open-source raster graphics editor used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks. GIMP is released under GPLv3+ licenses and is available for Linux, macOS, and Microsoft Windows.

Overview and Features

GIMP:

• Is free!!!
• Has almost all the tools of Photoshop
• Is portable, meaning, it does not take much of your hard disk space
• Is perfect for those who wants to buy Photoshop but doesn't have much money

Screenshots

Download

Given below is a copy-paste from the official GIMP website download page.

GIMP for Windows*

Download GIMP 2.10.8
via BitTorrent Download GIMP 2.10.8
directly

*GIMP is also available for Linux, OS X and macOS. You can get them by visiting the official GIMP website download page. 

Simutrans

If you're a fan of city-building games, this one's for you.

Simutrans is a cross-platform simulation game in which the player strives to run a successful transport system by constructing and managing transportation systems for passengers, mail and goods by land, air and water between places.

The Download Link is at the end.

Overview and Features

The main goal in Simutrans is to provide an efficient transport system for passengers, mail and goods to be transported to their desired destinations fast and with minimal transfers and at the same time making the company grow avoiding bankruptcy or administration.
Simutrans has a number of factory chains that are interconnected with other chains, for example, a coal mine produces coal for a coal power plant, and an oil rig produces oil for an oil power plant. The goods produced by these factories may be distributed to smaller factories or shops, such as gasoline to a gas station, coming from a gas storage facility, which retrieves the gas from an oil refinery, and so on.
Supplying a factory with electric power will increase the production and allows for fine-tuning the economy. Passengers and mail are transported between different cities and tourist attractions, and may use several methods of transportation to reach their destinations.
The Simutrans executable can run many different paksets, which is a package containing files called paks. Paks are files with graphic and data files that Simutrans uses to determine the objects in the game, it determines things like their resolution, appearance and behaviors. Gaming experience is therefore very dependent on the PakSet used.
Simutrans currently features 12 AI players, and has an online capability similar to OpenTTD since version 110.0. The terrain in Simutrans is freely-modifiable, and different layers like tunnels and bridges can be stacked, allowing for subways or highways to be possible. It has a day and night cycle, different climates and seasons. Nearly all modes of transportation exist in Simutrans. At least buses/trucks, trains, and ships are always provided. If defined in the PakSet, aircraft, monorails and/or maglevs can also be used.

Screenshots

Simutrans Pak 64

Map of a Simutrans game world, showing various cities

Underground Mode (Pak128)

Download

Given below are the original Download Links copied from their website. Click here to go to the Download page of Simutrans  website.

Windows

SteamInstallerGDI versionSDL version

Mac

SteamMac OSX

Linux

SteamSimutrans x86Simutrans x64

BeOS

Haiku