Recently I was in a need to download some documentation of a particular js library so that I could refer to it offline later. After searching google found this
HTTrack Website Copier
HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
It allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site’s relative link-structure. Simply open a page of the “mirrored” website in your browser, and you can browse the site from link to link, as if you were viewing it online. HTTrack can also update an existing mirrored site, and resume interrupted downloads. HTTrack is fully configurable, and has an integrated help system.
WinHTTrack is the Windows 2000/XP/Vista/Seven release of HTTrack, and WebHTTrack the Linux/Unix/BSD release.
Check it out …
Real-time log monitoring in your browser
How does Log.io work?
Harvesters watch log files for changes, send new log messages to the server, which broadcasts to web clients. Users create stream and history screens to view and search log messages.
More Info at log.io