| Alpha | ALPHA conversion |
| Cfg | Code to compute the control-flow graph of a function or file. |
| Cil | |
| Cillower | A number of lowering passes over CIL |
| Clist | Utilities for managing "concatenable lists" (clists). |
| Dataflow | A framework for data flow analysis for CIL code. |
| Dominators | Compute dominators using data flow analysis |
| Errormsg | Utility functions for error-reporting |
| Formatcil | An Interpreter for constructing CIL constructs |
| Pretty | Utility functions for pretty-printing. |
| Stats | Utilities for maintaining timing statistics |