I´ve found Harsel as optware package.
Haserl is a small program that uses shell or Lua script to create dynamic content with CGI scripts. It is intended for environments where PHP or ruby are too big. On nslu2, because of the limited RAM resource, CGI can sometimes outperform other solutions. The webif project for openwrt firmware uses haserl to build web interfaces for routers.
Nemik,Is it what you recommend me? 