Tesseract and Leptonica libraries compiled for iOS.
There is no support for armv6, so it won't work with iPhone 1st Gen and iPhone 3G.
You might want to use this tesseract-ios to include Tesseract in your iOS project. For a more advanced usage, you can use the raw library with regular C++ code.
Don't forget to rename your implementation classes with
.mas it uses C++ code.
Follow this blog post for more informations.