1. WordPress
WordPress is the most popular publishing platform, now you can use it directly from your iPhone for free. You can create new posts or edit the existing ones, add photos, check spelling and create links without writing HTML codes.
2. SimpleMind Touch
SimpleMind Touch is a Mind Mapping tool that turns your iPhone or iPod touch into a brainstorming, idea collection and thought structuring device.
3. ServersMan

This app converts your iPhone into a portable flash drive! So now storing your data and taking it everywhere with your is easier than ever with this app. This app can prove to be really useful for people who need to transfer data from one PC to the other frequently.
4. Jsany – JavaScript Anywhere
Jsany is one of the oldest development environment on iOS since 2010. It’s simple and portable editing tool for web engineers and designers.
5. Zapd
Create beautiful, social websites. In 60 seconds. From your iPhone. Zapd is the original iOS website builder. We were an App Store Rewind 2011 list, an Apple Staff Pick, App of the Week and a Top Ten App in 20 countries!
6. Air Display
Air Display lets you use your iPad as a wireless display for your Mac OS X computer. Why is this great for developers? Because we need screen real estate, baby!
7. FTP On The Go
If your website need some fixes and modification and you are not you desk then this application will helps you. This application lets you login into your sever from your iPhone.
8. Pingdom
Pingdom is an uptime monitoring service and this application will help you to connect to it from your iPhone. You can get alerts directly to your iPhone, view current status of monitored sites, view uptime and response time stats and get information about each check such as monitoring resolutions.
9. Web Developer Bible
The title of this app says it all, handy reference for all web developers. It also includes RGB to HEX color convertor, so no need to google or search for color converters in your system.
10. iSSH
A full-featured SSH and Telnet emulator of VT100, VT102, VT220, ANSI, and xterm terminals integrated with a tunneled VNC client, RDP client and an X server. Secure, powerful, intuitive, configurable and complete are a few words used to describe iSSH. A universal app for both the iPhone and the iPad, hands down iSSH is the best ssh client available. iSSH is the only app with agent forwarding, tunneling and an X11 server available within the app.