Celerity is a powerful application for reading and maintaining C/C++ projects. It can process millions of source code lines. It supports standard C/C++ (and K&R style of sources as well). For each analyzed project, it produces a multifaceted cross-referenced database and shows the source files, include files, source and include files, indexes of lexical elements, index results, includes, include-by's, all macros, macros in a translation unit, all definitions, expandable definitions in a file, expandable definitions in a translation unit, references (function declarations and invocations), reference-by's, contents of per-directory definitions, construct hierarchy, diagnosis outputs, symbol searches, favorites, etc.