Not true. "Then, an animatic movie is created by artists using custom plugins in Alias|Wavefront's 3-D animation package Maya." Maya is now owned by Autodesk, and is available for Windows, OSX, and Linux. It's not a custom application.
OK, so sorry - 99% of them. Your point was so well received.
Going through the article, these are the numbers I found:
Maya - Not custom
ToonShooter - custom
ToonSketch - Probably custom, not mentioned in the article
ScanLevel - Not custom
ProcessLevels - custom
InkAndPaint - custom
Studio Paint - Not custom
Custom Apps: 4
Not Custom: 3
Apps mentioned are 57% custom, 43% not.