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I don't know a good answer. But do you want to find a general package or you want to find a way to write something yourself? If latter, you may use explicit representations of Gamma matrices, for example, defined in 4d in Peskin's QFT book or in a general integer dimension in Polchinski's String theory book. In this case the gamma matrices are explicit matrices thus every calculation is straightforward.

On the other hand, if you want to do something more abstract, non-commutative rings (or groups?) may help. But currently I haven't fully understood Sage's construction about rings and groups yet.

As another suggestion, you may want to ask the question more explicitly. Otherwise only particle physicists could understand your question ;)

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