GitHub is where people build software. More than 12 million people use GitHub to discover, fork, and contribute to over 31 million projects.
Notepad++: a free source code editor which supports several programming languages running under the MS Windows environment.
FileZilla is a cross-platform graphical FTP, SFTP, and FTPS file management tool for Windows, Linux, Mac OS X, and more. With tons of intuitive tools.
Majestic - Link intelligence tools for SEO and Internet PR and Marketing. Site Explorer shows inbound link and site summary data.