Added 2pac

_software/2pac.md

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+---
+name: 2pac
+title: two-parameter persistent (co)homology
+tags:
+  - lang/c++
+  - lang/python
+  - lang/cli
+  - type/multiparameter
+  - type/persistence
+  - complex/rips
+  - custom/boundary-matrix
+  - custom/distance
+  - custom/filtration
+links:
+  - name: GitLab repository
+    url: https://gitlab.com/flenzen/2pac
+---
+
+The program 2pac computes a minimal free resolution of 2-parameter persistent cohomology and homology of function-Vietoris-Rips complexes of a finite metric space, and of other, user-defined two-parameter (co)chain complexes.
+Computation of minimal free resolutions is performed either directly, analogous to mpfree, or via a cohomological algorithm that in many cases gives a noticeable speedup.
+The data can be optionally preprocessed using the chunk algorithm and/or (strong) filtration domination.