Microsoft File Checksum Integrity Verifier ( MD5 or SHA1 )

http://www.microsoft.com/en-us/download/details.aspx?id=11533

Windows Tools

got myself some free tools to use

Folder size,
http://www.mindgems.com/


Clean temp folder,
http://www.piriform.com/ccleaner/download

JRuby Platform detection

p/s: This is by no means my work, i take no credit, however this post serves as memory bank as i am a goldfish.I thank the owner for sharing on the web.


useful excerpt for my case:
Quote
======
2. Platform detection. I've seen this question lots of times. Since in JRuby, RUBY_PLATFORM constant is always "java",  users are unclear how to detect the underlying platform. It is pretty straghtforward with rbconfig module, JRuby fully supports it:
   require 'rbconfig'
   Config::CONFIG['host_os'] # returns mswin32 on Windows, for example

There is plenty of additional info in Config::CONFIG, just print it out to see.
======


Links:
http://ruby.dzone.com/articles/10-hot-tips-jruby