This site has various FREE online tools like
1)’eMail Tracker’ (it can assure that the email has been opened by recipient by logging time, IP address and browser page referrer when email is opened)
2)’File Tracker’ for MS office Word, Excel, Power Point (it can be used to reduce file piracy by logging time and IP address when file is opened),
3)IP address finder,
4)MD5 SHA1 hash calculator etc.
You can download various FREEWARES like
1)’PCTimer’ (it is no-install computer alarm clock that can play *.wav files as alarm tone and can hide itself on system bar)
2)’Binarius Screen Saver’ (it displays zero and one at random locations on screen, little-bit different than MATRIX screensaver) etc.
There are links to various learning resources like ebooks, tutorials, source codes for C, C++, Visual Basic, HTML, JavaScript, VBScript, Perl, PHP, Ruby, SQL etc.