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My Gateway to Logic displays truth tables, expression trees, alpha graphs, normal forms and so on, both in a server side and a client side version. It proves theorems of propositional and predicate logic and contains a proof checker and a Lemmon-style proof builder as well as a Fitch-style proof builder and even a proof builder of the Alpha Part of Peirce's Existential Graphs. In 1996, Jars has rated the Gateway "Top 25%", and Gamelan considered it "cool".
Part of the Gateway requires a Java-capable browser, part works with virtually any browser, even with text-based programs like Lynx.
There are several lists of logical web resources. The following are among the best: