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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="http://klee.github.io/">KLEE</a> has similarities
13 but is not a formal proof system.
15 <li> <a href="http://compcert.inria.fr/">CompCert</a>
16 is INRIA's verified C compiler (not open source).