Here is just a partial list of whats out there for the Amiga(and whats not).
Miami TCP/IP: Cannot be registered any longer. Keys of dubious origin rumored to be "around".
Genesis TCP/IP: Full version available on OS3.9 CD. Available from Amigakit.
IBrowse2.3 Web Browser: Still Registerable. Supposedly still being improved. There is rumored to be a 2.4 upcoming?
AWeb: Web Browser. Free, Open Source. Available, but with all the nuance of open source software in general.
AmiIRC: IRC Client. Not registerable. See note on Miami.
YAM: Excellent POP Email client. Free and still being worked on.
MakeHTMLMap: Page Creation Tool. Registerable and actively being worked on.
AmiFTP: ftp client. Not registerable? Not sure about that one..
Microdot and airmail: email clients. Not registerable.
Voyager: Browser. Not registerable.
WebPlug: Page Creation Tool. Free, non-active.
Moovid: Multimedia (QT) player. Registerable, non-active.
Frogger: Multimedia Player. Registerable, non-active.
Opus 5.82: Directory Utility w/ good FTP tools. Registerable, non-active.
Frying Pan: CD/DVD Recording tool. Registerable. Active project.
Pagestream: DTP and Page creation. Registerable. Active. Excellent!
Cubic IDE: C++, backoffice, server side, dev tools, etc. Registerable, active.
Imagine 6: 3D Rendering. Registerable, active.