APNG Software

1. RealWorld Paint is a powerful free image editor with animation support.

Pros: RealWorld Paint can load and save APNG files, and it supports lots of other image formats too. It also includes extensive editing options, with layers and styles. It can convert animations to filmstrips and vice versa, add or remove frames, change animation speed.

Cons: Not cross-platform, Windows only.

2. VirtualDub APNG Mod provides Animated PNG support for the popular video editing software VirtualDub. It can load and save APNG, with or without alpha channel. Automatic frame difference optimization helps to compress files more. VirtualDub filters provide a lot of processing options - crop, resize, etc.

Pros: Accepts all kind of input - video, image sequences, APNG/MNG files. Good compression.

Cons: Not cross-platform, Windows only.

3. APNG Anime Maker is another program to create animated PNG files.

Pros: Provides flexible optimization options, including lossy with adjustable tolerance level, over selected image region.

Cons: Not cross-platform, Windows only.

4. Japng Editor is a Java library/editor to create APNGs from a sequence of individual images.

5. GIF Movie Gear is a professional GIF animation software with APNG support.

6. gif2apng and apng2gif converters.

7. APNG Optimizer.

8. TweakPNG is a low-level utility for examining and modifying PNG/APNG files. You could edit time delays in fcTL chunks, assign a transparent color by creating tRNS chunk, edit palette, remove unneeded chunks, and much more.