Startrails

Obtain photos of the trail left behind by the stars

OpenUniverse

Discover the Universe using your computer screen as a telescope

Celestia

Travel around the Universe from your PC

Sky Charts

Hundreds of star charts in a single program

StarStaX

Create spectacular composite photos

Moffsoft FreeCalc

Useful calculator similar to that of Windows

Virtual Moon Atlas

Complete and appealing virtual atlas of the Moon

Cool YouTube Downloader

Download all the videos that you want from the Internet

Stellarium

Interesting application that lets you see the universe on your computer

Asynx Planetarium

The Universe from your computer

Asteroid Data Hunter

Become the best asteroid hunter

VideoTodo

Download videos from sites like YouTube, Megavideo or Google Video

Khi3

Complete scientific calculator with plenty of options

WinStars

Put a planetarium on your PC's desktop

Calculator

Carry out the fastest maths calculations

SpeedCrunch

Mathematical calculations within everyone's grasp

Yahoo Mail

Access to your Yahoo email account

Mailspring

Mail client to boost user productivity

Turbo Mailer

Send mass emails

Microsoft Outlook

Microsoft's email client

IncrediMail

Customize your email's appearance and give your friends a surprise

Spark

Complete mail client compatible with different services

Inky

Receive all your emails in a single client

Outlook Connector

Use your Hotmail accounts straight from Outlook

Free Email Extractor

Easily gather email addresses

Thunderbird Portable

Use this email manager on any PC with a USB port

Mail Bomber

One of the best massive email delivery programs

Zimbra Desktop

Manage all your accounts from the same application

Stellar Converter for OST

Convert your Outlook emails to PST format

Mail, Calendar, and People

Plan your day and keep in touch

Windows Live Mail

Microsoft's multi-account email client