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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).

This is a formalisation of Wim Ruitenburg's paper "On the Period of Sequences (An(p)) in Intuitionistic Propositional Calculus" (JSL 1984).

A Coq formalization of the HM logic of open bisimulations in pi-calculus, developed originally by Frederik Haselmeier’s as a part of his MSc thesis with a specific take on the locally nameless approach (called LN_\pi by Frederik)

Paul Wild's development of Aarhus ModuRes library

Coq formalization of guarded iteration a la https://www8.cs.fau.de/_media/research:papers:elgot-retract.pdf.

A Coq formalization of "Negative Translations and Normal Modality".

An abortive attempt by Ulrich R. to formalize de Groote's paper

CORQUE stands for CORecursive eQUations over Effects. This project contains a Coq formalization of complete Elgot monads, their corecursive extensions and background proofs for the paper Unguarded Recursion on Coinductive Resumptions...