MobileTerminal.app, a terminal emulator application for the iPhone. MobileTerminal.app is NOT an SSH client, nor Telnet for that matter. It can however be used to execute a console ssh-client application.
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Put iShare on your iPhone and you can upload to your free sendspace account and share links in the usual way. You can share any type of file. You can even get us to send the link to a recipient via email. They will not need an iPhone to download the file, but if they do want to download the file to their iPhone, they can if they have iShare installed.
A text editor for the iPhone.
iFlickr is a native application for iPhone's to access and use the service "Flickr".
DockSwap "swaps" out the Dock Image of your iPhone.
A native iPhone calculator application.
The goal of Mobile-RSS is to create a native iPhone application which will remember all your feeds and give you an easy interface for viewing, adding, and removing.
Using a simplistic approach, keeping a unified GUI in mind, and using the most light weight methods for executing tasks, MobileChat is the premier AIM Application for the iPhone. In fact, it's so light-weight and efficient that it runs just about as well on the EDGE network as it does on any WiFi network!
Mobile Colloquy for iPhone, based on the great IRC core from the Mac OS X version of Colloquy.
Squid is a native file manager for the iPhone.