you could use these java  libs to provide webservices such as :
1- Apache Axis
2- JBoss WebService
3- XFire
and for your GUI i think it depends on your Architecture that you have chosen,
such as :
Application Server (JBoss AS - BEA WebLogic - IMB WebSphere - Sun Glassfish - JOnAS - Resin)
Web Server (Apache Tomcat - JRun - Jetty - Jigsaw)
View Thechnology (JSF - Struts - JSP - Servlet)
Framework (JBoss-seam - Spring - ...)
Ajax (Richfaces - Icefaces - Ajax4jsf)
and etc...