As a Developer my self I'm always looking for tool that can help my life easier and I thought that it would be good if I don't have to install it and deal with so many complexity so an online tool would be the ideal one. I found a bunch of them and and is extremely very easy to use.
1. Sprite Cow
Personaly I really love this tool. Simple and very easy to use. You just need to upload your design and select the are that you wanted for your CSS sprite. One thing to NOTE though is if you have bunch of buttons for example or actually any objects on your design, make sure that they have enough space in between. Because if not, their program won't be able to get the exact area you are specifying.
http://www.spritecow.com/
2. Minify CSS
There are plenty of minifier and compressor out their that does good job but it's more complicated to use. MinfyCSS however is an online tool that eliminates the complication and still does a very good job.
http://www.minifycss.com/css-compressor/
3. favicon.cc
Converts most image format into .ico to use as favicon on your website. The good thing about this tool is they also offer animation to your favicon.
http://www.favicon.cc/
4. Yahoo! Smush.it
Optimizes your images. Also does a good job without comprimising the quality of your images.
http://www.smushit.com/ysmush.it/
5. JPEGmini
A JPEG minifier tool. Minifies your JPEG images without lossing the quality.
http://www.jpegmini.com/main/shrink_photo
6. Sketchbooks of a web Developer
A printable template for all your sketching needs. Weather your desigining for a website, logo or fonts.This is the right place for you.