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5 <h1>Alternatives and related programs</h1>
8 <li> <a href="https://www.adacore.com/sparkpro">Ada SPARK Pro</a>
9 is a formally verified subset of the Ada programming language
10 (tagline: <i>"You simply can't write better code"</i>).
12 <li> <a href="https://lamport.azurewebsites.net/tla/tla.html">TLA+</a>
13 is useful for proving distributed systems over time.
15 <li> <a href="http://why3.lri.fr">Why3 / WhyML</a>
16 can be used for constructive proofs.
18 <li> <a href="http://compcert.inria.fr/">CompCert</a>
19 is INRIA's verified C compiler (not open source).
21 <li> <a href="https://gitlab.mpi-sws.org/iris/refinedc">RefinedC</a>