Janino 

Janino is a compiler that reads a Java expression, block, or source file, and generates Java bytecode that is loaded and executed directly. It is not intended to be a development tool, but an embedded compiler for run-time compilation purposes.
java compiler embedded expression evaluation script scripting jvm virtual machine bytecode run-time compilation jsp

UniParser for Ada 

Ada library for creating grammar parsers and lexers. Supports Unicode and other kinds of streams. Powerful, flexible and extensible. Creates syntax tree. Has various pre-defined constructs. Arbitrary reliable look-ahead. Object oriented.
parser generator grammar generator lexer generator ada library bnf grammar tree parsing tree unicode