If you're willing to compile it, Aseprite is a great option as well.
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If you’re using Unity to create a location-based experience or VR environment, their Asset Store has some good news for you. The company has partnered up with a service-provider that can make your work a lot easier.
WRLD offers a 3D mapping asset that provides a fully textured, geospatially accurate world for your project. They do all of the hard work on their side, so you can focus on creating a great user experience.
The WRLD Unity SDK package contains default materials you can use as a foundation to build on for your own project. All you need to do is provide the coordinates, and WRLD will provide a fully textured 3D environment using a real-world global coordinate system.
The WRLD team just released a new version on the asset store with improvements and features for:
- Interacting with buildings, obtaining anchor points
- Highlighting buildings
- Obtaining building outlines
- Much simpler positioning of Unity objects in WRLD