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Catalog of Compiler Construction Tools - 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.
Meta Description: [ Freeware and Commercial Resources for Compiler Writers. ]

500 Cetus - An infrastructure for writing source-to-source compilers for C, C++, or similar languages.

CoSy - 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.
Meta Description: [ The ACE Group delivers advanced system software products and services. ]

Eli: An Integrated Toolset for Compiler Construction - Eli is a domain-specific programming environment designed to generate compilers for programming languages from specifications. Eli contains a vastlibrary with precoined solutions and reusable components and is Open Source.
Meta Description: [ Eli is a domain-specific programming environment designed to generate compilers for programming languages from specifications. Eli contains a vastlibrary with precoined solutions and reusable components. ]

Free Compiler Construction Tools - List of lexers, parser generators, code optimizers (optimizer generators), and other compiler construction kits.
Meta Description: [ Free Lexical Analyzer Generators, Parser Generators, Compiler Construction Kits ]

Gentle - 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.
Meta Description: [ GENTLE supports language recognition, definition of abstract syntax trees, construction of tree walkers based on pattern matching, smart traversal, simple unparsing, and optimal code selection. ]

500 JACCIE - Java-based Compiler-Compiler in an Interactive Environment.
Meta Description: [ Jaccie Homepage - a visual compiler-compiler for educational purposes ]

LLVM - A compiler infrastructure designed for compile-time, link-time, runtime, and idle-time optimization of programs from arbitrary programming languages. LLVM is written in C++. It currently supports compilation of C and C++ programs, using front-ends derived from GCC 3.4 to SPARC v9 and X86 architectures, a back-end which emits C, and a Just-In-Time compiler for X86 and SPARC v9 processors. [University of Illinois Open Source License]

Mozart - 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.
Meta Description: [ Home page for Mozart, an extensible development envionment ]

PFX - A tool to create compilers, assemblers, linkers for a range of targets. Special emphasis will be on embedded systems. In development.

Relational Meta-Language (RML) - Generation of efficient compilers and interpreters from Natural Semantics Specifications. Semantics for real programming languages like Java, Pascal, Modelica were developed.

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

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.