The only (active) project I know that implements a full SPV client is BitcoinJ, which is written in Java.
Does somebody know if there are any SPV implementations in other languages (like C) too?
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bitc is a thin SPV bitcoin client. See https://github.com/bit-c/bitc . It's not very advanced yet (no HD wallets, change goes back to first address), but it's small and self-contained.