| Platform | ACL+CLIM | C++ / Unix | C / Unix | C# / Windows |
| License | MIT (but requires non-free ACL) | LGPL | MIT | MIT |
| Configuration | Proprietary Lisp files | Proprietary TDL files | Proprietary TDL files | Reads both LKB and PET configuration formats |
| Preprocessing | REPP | REPP | REPP | REPP |
| Structured Input | SMAF (deprecated) | PIC, FSC, YY, SMAF | YY | none |
| Chart Mapping | No | Yes | Yes | Yes |
| Parsing | CKY | CKY | CKY | CKY |
| Packing | Yes (normally off) | Yes | Yes | Yes |
| Unpacking | Exhaustive / Local Selective | Selective | Selective | Exhaustive |
| Generating | Yes | No | Yes | Yes |
| POS Tagging | No | TnT | Integrated or TnT | Integrated |
| Unknown Word Handling | Generation Only | Parsing Only | All except generating non-CARGs | Parsing Only |
| VPM | Yes | Yes | Yes | Yes |
| Transfer | Yes | No | Yes (immature) | No** |
| [incr TSDB] Support | Yes | Yes | Basic | Some* |
| Multiprocessing | No | No | No | Yes, extensive |
| Multiple Simultaneous Grammars | No | No | No | Yes |