Animated Portable Network Graphics

APNG Anime Maker [cphktool]
Each frame has its own settings: Delay, ...

4 free tools to create Animated PNG (APNG) [instantfundas.com]

Animated PNG demos [mozilla.com]

Mozilla Labs reveals animated PNG editor for Firefox [arstechnica.com]

Animated Portable Network Graphics (APNG) [wikipedia.org]

Learn How To Create An Animated PNG [truekolor.net]

Examples