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LIL
Little interpreted language (LIL) is a very nice suckless, yet practically unknown interpreted programming language by Kostas Michalopoulos which can very easily be embedded in other programs. In this it is similar to Lua but is even more simple: it is implemented in just two C source code files (lil.c and lil.h) that together count about 3700 LOC. It is provided under zlib license. More information about it is available at http://runtimeterror.com/tech/lil.
{ LIL is amazing. I've been able to make it work on such low-specs hardware as Pokitto (32kb RAM embedded). ~drummyfish }
LIL has two implementations, one in C and one in Free Pascal, and also comes with some kind of GUI and API.
The language design is very nice, its interesting philosophy is that everything is a string, for example arithmetic operations are performed with a function expr which takes a string of an arithmetic expression and returns a string representing the result number.