mIRC

Chat on IRC with this great client

Turbo Mailer

Send mass emails

Windows Live Mail

Microsoft's multi-account email client

ICQ

Complete instant messaging client integrated with social networks

Guitar Tuner

How to tune your guitar or any other string instrument

Zimbra Desktop

Manage all your accounts from the same application

Trillian

A multiplatform chat client

Outlook Connector

Use your Hotmail accounts straight from Outlook

Visual Chat

Create your own chat channel in 3D

Microsoft Outlook

Microsoft's email client

Yahoo Mail

Access to your Yahoo email account

Pirch

One of the most popular IRC clients of its time

IncrediMail

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

Stellar Converter for OST

Convert your Outlook emails to PST format

Mail Bomber

One of the best massive email delivery programs

Free Email Extractor

Easily gather email addresses

FluidSIM

Program to create exciting electro-pneumatic circuits

ArgusLab

Application to view and develop molecules

Serial Cloner

Molecular biology application

PhET

Carry out dozens of scientific experiments from your PC

EniG. Periodic Table of the Elements

Free periodic table of elements with many extra features

Physics 101 SE

Learn physics and calculate anything whenever you want

Curved Spaces

Represent interconnected universes on your PC

Physion

2D virtual physics laboratory

QPeriodicTable

Discover all the secrets of the chemical elements

Biogenesis

Observe the evolutionary process of various organisms

Model ChemLab

Simulate a chemistry lab on your PC

ChemSketch

Tool to learn chemistry by drawing compound structures

SnapGene Viewer

Observe DNA sequences

Algodoo

A fun way to learn physics