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It is complicated to install applications on the RAM of a Live CD, and all the changes made to those programs and the installation itself will be lost once the computer is rebooted, so a good alternative is to use portable applications, that can be run from either the Live CD, or from a USB flash drive connected to the computer; there is even software dedicated to create those portable applications (VMware ThinApp, Virtual Application Studio or others).
PSGI or Perl Web Server Gateway Interface is an interface between Web servers and Perl-based Web applications and frameworks that allows writing portable applications that can be run as standalone servers or using CGI, FastCGI, mod perl, et al.