Audiobook Bundle! Self-Command: How to Get Yourself to Do Things, plus its follow up, Self-Doubt. Also includes Self-Calm - a modernization of Meditations by Marcus Aurelius
Videogame Developer's Strategy Guide -- HobbyGameDev's 50+ best articles
Why Make Games (+How to Start) Infographic
From Tutorials to Original Games
Self-Calm, based on Meditations by Marcus Aurelius free ebook/text - the full audiobook is also 100% free on YouTube