Abstract: In this paper we describe how lexical resources for Serbian, developed within the Human Language Technology Group, such as various types of electronic dictionaries and aligned texts, can be further refined and used for different purposes, by means of tools specially developed for these tasks. The tools we describe are WS4LR, a software tool that has already been developed and used for solving different tasks within the Group, and a web application named WS4QE, accompanied by several web services, that enables the solution of various tasks via the web. Besides a short description of the lexical resources for Serbian involved, we shall also describe how the functions of the WS4LR tool can be used for their maintenance and development, as well as some possibilities for web query expansion offered by the WS4QE web application and the use of these expanded queries.