A passerby commented in late 2009 that "... some of these programming channels have bots that evaluate scripting statements and such to make it easier to answer people's questions.. like #bash has evalbot ..." While such arrangements rather perplex Tcl culture, there are several live Web applications that permit "installation-free" Tcl evaluation, including http://codepad.org/ .
For a different perspective on freedom from installation, see tclkit.