security

TrueCrypt was an application which could be used to create virtual encrypted disks within a file or encrypt entire partitions or storage devices. I said "was" because Truecrypt's homepage started redirecting to its SourceForge page and a warning is displayed at the top of the page:

If you write software for the web that allows users to submit or share URLs (comment systems, mail clients, forums, URL shorteners, etc), you may find yourself in a position where you need to filter out malicious links.
Fortunately, there are several free options for you to better protect your systems and your users against bad guys, and they’re pretty simple to implement. (My examples are in PHP, but could easily be adapted to whatever language you prefer.)
Google SafeBrowsing