Anima and Anima scripts are open-source and thus available on github. More information on how to get them and compile / configure them is available from the documentation.
Anima and Anima scripts also come in several binary packages released from time to time.
Latest Anima binary release: Anima v4.0 - Release notes
Latest Anima scripts release: Anima scripts v3.0 - Release notes
Latest Anima scripts data release: Anima scripts data v3.0 - Release notes