Connect your desktop or web browser to your mainframe
This is the easy one. Glink for Windows or Glink for Java are the products of choice. All the emulations you will ever need are included. You have two deployment options: Professional for workstation licensing. Enterprise for centralised management and deployment.
Glink for Windows
Glink for Java


Facelift your mainframe application's look & feel
Some programming experience is required but it is not a huge effort to make a local Microsoft .NET (Visual Basic) application do great things with data from your legacy applications. GlinkVisual is the product to use here.
GlinkVisual

Make your mainframe application look like a web page
This is a great one for e-commerce. The robustness and scalability of your mainframe ERP system with the flexibility of web front-ends to show off to the public. You could ofcourse use a dozen Windows servers to do this but why not use your legacy system? GlinkWeb is the product to look at if you go down this path. Use ASP or JSP pages on top of Glink for Windows or Glink for Java.
GlinkWeb
Gweb

Integrate (web) applications with mainframe data
This is where the heart of real software developers starts,. The real fancy tight integrated WebApss come to life using Gargen and Gconnect.
Gargen
Gconnect

Do something specialized not yet mentioned
Something like talking to a Bull mainframe in the most efficient way. That is where Ggate comes in. Groundbreaking performance records and unlimmited scalability.
Ggate