J2ME VNC
A remote display system which allows you to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures.

Jimm
ICQ clone for J2ME MIDP. Connects directly to the ICQ network. Uses protocol version 8.

MidpSSH
MidpSSH is an SSH and Telnet client for MIDP 1.0 / 2.0 (J2ME) devices

Mobile GMaps by Cristian Streng for
Displays Google Maps, Yahoo! Maps, Windows Live Local (MSN Virtual Earth) and Ask.com Maps and satellite imagery. It can use GPS to automatically display the map for your current position.

Mojab by Radek Burget
A Jabber client for mobile phones with J2ME support.

Opera Mini
Opera's free Java browser

Putty for Nokia 9210, 9300, 9500 and 7710
Free SSH client

RSS Reader MIDlet by Gösta Jonasson
An RSS feed reader for handhelds that can run Java MIDlets(J2ME). It uses RMS (persistent storage) for offline reading. It is MIDP 1.0 CLDC 1.0 compliant. Doesn't work with Nokia 6600?

SmallServ by John McAleely for 9210
Simple http server

Symella for Series 80 by Imre Kelényi&Balázs Molnár
Gnutella (Peer-to-Peer file sharing network system) client. Only for downloading.

Telnet by Systems.to for 9210
Another Telnet(SSH) for the Nokia 9210

WebViewer by Reqwireless
Reqwireless WebViewer is an HTML Web browser

WLIrc by Sverre Kristian Valskrĺ
IRC Client for Java cell phones or any other device who support java MIDP 1.0 (j2ME).