Catalog of Compiler Construction Tools  catalog.compilertools.net The resource overview includes compiler construction kits, lexer and parser generators, attribute grammar systems, transformation tools, front- and back-end generators, program analysis and optimization, environment generators, infrastructure/components/tools and compiler construction with Java.

CoSy  www.ace.nl A flexible compiler development system for languages like C, DSP-C and Java, enabling architecture and compiler developers to generate and reconfigure efficient and robust compilers quickly for their existing and future cores.

Eli: An Integrated Toolset for Compiler Construction  eli-project.sourceforge.net Eli is a domain-specific programming environment designed to generate compilers for programming languages from specifications. Eli includes a vastlibrary with precoined solutions and reusable components and is Open Source.

Free Compiler Construction Tools  www.thefreecountry.com/programming/compilerconstruction.shtml List of lexers, parser generators, code optimizers (optimizer generators), and other compiler construction kits.

Gentle  gentle.compilertools.net A compiler construction system that supports language recognition, definition of abstract syntax trees, construction of tree walkers based on pattern matching, smart traversal, simple unparsing for source-to-source translation, and optimal code selection for microprocessors.

Irony  www.codeplex.com/irony .NET compiler construction kit. It use the target language grammar coded directly in c# using operator overloading to express grammar constructs. [Open source, MIT License]

LLVM Compiler Infrastructure  llvm.org An aggressive open-source compiler for C and C++ and Stacker, a forth-like language. It specializes in interprocedural optimization and analysis, and handles runtime and offline optimization "in the field" as well.

Mozart  mozart-dev.sourceforge.net A set of APIs and a file format that allow various development tools such as compilers, editors, class browsers and others to exchange data and cooperate. Currently, Mozart parses and "renders" only Java, although internally it is language neutral.

Relational Meta-Language (RML)  www.ida.liu.se/~pelab/rml Generation of efficient compilers and interpreters from Natural Semantics Specifications. Semantics for real programming languages like Java, Pascal, Modelica were developed.

SUIF  suif.stanford.edu Extensible compiler system that supports parallelization, object-oriented programming languages, scalar optimizations and machine-specific optimizations.

Zephyr  www.cs.virginia.edu/zephyr Its philosophy: build compilers from parts, which might include front ends, back ends, optimizers, and the glue that holds all these pieces together. You might even generate parts automatically from compact specifications.