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Depending on your needs, there are quite a few of them. For smaller or non-commercial projects, you can use the free version of Delphi. Creating a native desktop app is superfast. The downside is that if you need multiplatform support you need to pay. If you care about Windows, you can just use Visual Studio and one of the languages included.

If, however, you want a free tool to rapidly create multiplatform apps, I think the only real contender is Lazarus. It has some rough edges at places, but it works quite well, you can construct medium-complexity apps quite easily, and it's really fast.