Emdros - Open source text database engine, including query-language, for storage and retrieval of linguistic analyses of text. Documentation, download and project updates. - http://emdros.org/
DGA: Dependency Grammar Annotator - A Java-based interactive graphical tool for the syntactic annotation of texts within a corpus, guided by the formal framework of Dependency Grammars. Demo, download and documentation. - http://phobos.cs.unibuc.ro/roric/DGA/dga.html
Alembic Workbench - Corpus analysis toolset from the MITRE Group, including SGML annotation tool. Download, documentation, research. - http://www.mitre.org/tech/alembic-workbench/