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Not sure if Sage has anything, but there is a GAP package called "Forms".

See http://gap-system.org/Packages/forms.html.

Not sure if Searching the Sage has anything, but documentation and source seems to indicate there is nothing in Sage for that.

Indeed

sage: search_doc("witt")
sage: search_src("witt")

only have references to other Witt things.

However, there is a GAP package called "Forms"."Forms" which you might find useful.

See See

• Forms in GAP package index: http://gap-system.org/Packages/forms.html.

• Forms package home page: http://cage.ugent.be/geometry/forms.php
• Forms package documentation: http://cage.ugent.be/geometry/software/forms/chap0.html
• "Witt index" entry: http://cage.ugent.be/geometry/software/forms/chap5.html#X85FA387280DAEA69