Tux Paint for iOS (iPhone, iPod Touch, iPad) (Unofficial)
A 3rd party has ported Tux Paint to iOS, and released an 'App' for Apple iPhones, iPod Touches, and iPads. It is available for free in the App Store as "Tux Paint Free". (This version is not officially supported by the Tux Paint developers, though the developer is participating in the project.)
Compatibility note: The current version of Tux Paint requires iOS version 6.0 or later.
June 28, 2021 - A new version of Tux Paint has been released! Version 0.9.26 is currently available for Microsoft Windows, Apple macOS, Android, Red Hat Linux, various Linux distributions (via Flatpak), and as source code. Read the press release.
Tux Paint Free (includes many Rubber Stamps):
Did you know? Tux Paint runs right on your computer, and doesn't require Internet access.