Close #17, add tools

tools/sat-smt/gappa.md

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+date = 2025-06-07
+draft = false
+title = 'Gappa'
+subtitle = 'Theorem Prover'
+links = [
+    { title = "Homepage", url = "https://gappa.gitlabpages.inria.fr/", icon = 'fa-solid fa-home' },
+    { title = "Source Code", url = "https://gitlab.inria.fr/gappa/gappa", icon = 'fa-solid fa-code'  },
+    # { title = "Playground", url = "https://www.why3.org/try/", icon = 'fa-solid fa-gamepad' }
+]
+applications = ['SMT Solver', 'Theorem Prover', 'SAT Solver']
+developers = ['Inria']
+licenses = ['MIT']
+inputs = ['WhyML']
+interfaces = ['CLI', 'Why3', 'Coq']
+maintenance = ['Actively Maintained']
+# techniques = ['CDCL']
+# publications = ['deMoura2008']
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+
+<!-- {{<inactive year="2016">}} -->
+Gappa is a tool intended to help verifying and formally proving properties on numerical programs dealing with floating-point or fixed-point arithmetic.