treecc - the tool similar to TreeDL, with lex/yacc-like language, capable to generate C/C++/C#/Java code. Used in Portable.NET project's implementation of C# language compiler.

ANTLR - one of the most powerful parser generators. Used to parse input text and build tree described in TreeDL. ANTLR has built-in facilities for constructing and processing of trees, but they are focused on homogeneous trees and tree grammars. TreeDL supplements ANTLR in th field of heterogeneous trees processing.

SableCC - interesting compiler generator that produces parsers, strictly-typed abstract syntax tree descriptions and tree walkers (visitors).

Eclipse - one of the best Java development environments. The plugin for integration TreeDL into Eclipse is available.