UPDATED – 22/05/09: Added Reflector
Website: Beyond Compare
What it is: A file diff tool.
Beyond Compare is probably my favourite day to day tool and has given me an astonishing reduction in breakages when deploying code across systems. There are other free diff tools out there, however after evaluating most of them this is my favourite due to its intuitive design, colourful, easy to distinguish interface.
There is a small cost for the software but I think it is worth it.
See also: (Free) WinMerge
What it is: A free text/source code editor
I like Notepad++ because it is the complete opposite to most of the IDE’s and editors that I use, in that the application is not sucking up all of your RAM and grinding to a halt, when I quickly want to modify a text or HTML file. It makes a nice alternative to the usual Windows Notepad application as it has syntax highlighting for example and useful features such as regular expression based finds. I’ve recently taken to using Notepad++ for a recent PHP client project.
Website: Color Pic
What it is: A free colour picker, and palette
How many times have you needed to open Photoshop to get at the colour picker tool? For me – lots. I found this program helpful as, again, it does not gobble up RAM like Photoshop and is useful for storing a palette of colours indefinitely. I use this tool a lot for finding out what colour something is on a page or for Web Development work.
What it is: An open source Mind Mapping software
I find it very useful at a begging of a personal project to brainstorm everything I want to see in an application. It often becomes quite hard to document and visualize due to the excess of information. Mind Maps can be a really good canvas to paint your ideas on to.
I love how fluid the interaction with this application is. You can draft personalized maps very quickly and relatively intuitively. You can also save them in pdf or image format so others can read.
It’s not something you use lots but can really help when starting off on a project.
Subversion & Tortoise SVN
Website: Subversion, Tortoise SVN
What it is: Version control
I’ve used 3 version control systems in my life and this is my favourite by far. In fact when I look back to the days of Visual Source Safe – I shudder, it was that bad. I like Subversion because of its really well thought out logic and relatively low learning curve.
Subversion itself is the version control system, which comes with natively with a command line interface. I, like many people also install Tortoise SVN which integrates into windows so you can see the state of each file. Version control then becomes a right click, command operation. Easy!
See also: My article on free Subversion hosting
Firefox & Firebug
Website: Firefox, FireBug
What it is: A file compression + extraction tool
Throw away WinZip and WinRar and replace with this open source solution.
Website: IIS Admin
What it is: A tool for Windows 2000/XP that allows you to create multiple sites under IIS
I still use this tool a lot as it allows me to create multiple seperate website entities in IIS. This tool is not useful for any one using IIS 7 as it comes natively with this missing functionality.
Website: Twihrl, Twitter
What it is: Twihrl is a client for Twitter, based upon the Adobe Air platform. In case you are behind the times and don’t know what Twitter is – it is a social networking platform where users can post short messages or statuses. A bit like Facebook’s status message.
Why do I think it is a useful tool? Purely because it is a good educational/information tool. If you subscribe to people that “Tweet” (updating of their message), you can passively learn useful information.
What it is: Reflector is a tool that will disassemble an assembly so that you can read through the source code (as long as it is not obfuscated). I use it a lot for looking through third party code, or perhaps an old .dll that I may have built, but lost the source code for.