- TWAPI Tcl Windows API
- WiTS Windows Inspection Tool Set
- Woof! Web Oriented Object Framework
- Ruff! Document generation using introspection
- MeTOO MeTOO emulates TclOO
- isapi-scgi SCGI ISAPI extension for IIS
- JSON-RPC support in TclSOAP
- Palm Tcl (http://palm-tcl.sf.net) though no longer working on it (don't own a handheld anymore).
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