If you're willing to compile it, Aseprite is a great option as well.
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Have you heard about Wes McDermott’s book called The PBR Guide? A technical artist at Allegorithmic and Substance Integrations Product Manager released the book back in 2014, but the thing is that the book has been revised and expanded since then. The best thing is that Allegorithmic and Wes have decided to publish a new edition of the book once again with updated information as a part of their appearance at GDC 2018.
The book features new outstanding cover art by Elouan Harmand. If you’re at GDC right now and want to check out The PBR Guide, the book will be on sale on the Allegorithmic’s stand for j$10.
Here comes the best part. You can get an electronic copy of the book for FREE! The download link for the PDF of the book can be found at Substance Academy. There is also a version for ebooks in the works – you’ll soon be able to get one for zero dollars.
What are you waiting for? Go study the guide!