• FileZilla

From author's site:

Open Source fast FTP client for Windows with a lot of features. Perhaps the best free FTP program available. Among others, the features of FileZilla include the following:

- Easy to use
- Supports FTP, FTP over SSL/TLS (FTPS) and SSH File Transfer Protocol (SFTP)
- Cross-platform. Runs on Windows, Linux, *BSD, OSX and more
- Available in many languages
- Supports resume and transfer of large files >4GB
- Powerful Site Manager and transfer queue
- Drag & drop support
- Configurable Speed limits
- Filename filters
- Network configuration wizard