AzamSharp
Resources: Passive Income for Developers
Writing articles for Kodeco (Formally known as Raywenderlich.com)
Writing articles for CODE Magazine
Selling code on CodeCanyon
Selling themes on ThemeForest
Selling books on Gumroad
Selling books on LeanPub
Advertisement money on YouTube
[Making apps to sell on the app store]
Selling video courses on LinkedIn Learning
Selling courses on Udemy
Selling courses on Pluralsight
Selling courses on Skillshare
Publishing articles on Medium
Speaking - trySwift World
Patreon
List of other paid technical articles websites