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Utabcert is a Coq formalization of equivalence and containment results obtained by Sagiv and Yannakakis (Equivalence Among Relational Expressions with the Union and Difference Operators).
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Updated

This is a formalisation of Wim Ruitenburg's paper "On the Period of Sequences (An(p)) in Intuitionistic Propositional Calculus" (JSL 1984).
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Software / IMeOWL
GNU General Public License v3.0 onlyTransform bounded selfreference into plain owl files
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Software / gqmcoq
MIT LicenseUpdated 
Software / Epi RC
GNU General Public License v3.0 or laterThe Episciences Remote Control tool for episciences journals like LMCS
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Updated

Software / CoPaR
GNU General Public License v3.0 or laterUpdated 
Software / COOL
GNU General Public License v3.0 onlyA generic reasoner for modal and hybrid logics; it can be instantiated to any modal or hybrid logic admitting an axiomatization in terms of socalled rank1 rules or axioms
Updated