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Convex Lens

Convex Lens is described as a handy, smart and effective simulation which will help you investigate the interaction of light with a convex lens, and help you understand how a convex lens forms images. You can also use the simulation to investigate the limitations of the thin-lens equation that they often apply to situations involving convex lenses.
Requirements:

Java

File size: 1.4 MB
Platform: Windows All
License: Freeware
Price:FREE
Publisher:Andrew Duffy

OMNIQUAD

OMNIQUAD is regarded as an impressive and useful tool which is created to assist you in designing Omniquad antennas. The omniquad is a very simple but excellent standby vertical antenna. The main advantage is the extreme bandwidth. Make all the dimensional errors you want, and it will still work. 
You can use wire or tubing. A broom handle ,some 1/4 dowels and under 10 feet of wire will make a 2 meter antenna. There is very little gain or pattern difference between the 3 and 4 sided versions but the 4 sided version does give a better match. It can even [...]

ProfDistS 0.9.9

ProfDistS 0.9.9 brings you an advanced and convenient to use tool which provides a phylogenetic framework using individual RNA secondary structures in reconstructing phylogenies based on sequence-structure alignments. Moreover, ProfDistS can deal also with protein sequences.
Enhancements:

Now allows extended editing and loading of profiles
New FigTree conversion into ProfDistS profiles

File size: 14.7 MB
Platform: Windows All
License: Freeware
Price:FREE
Publisher:ProfDistS Team

VisSPA 1.6.2

VisSPA 1.6.2 proves itself to be a beneficial as well as interesting Windows program that accepts an alignment of sequences, interactively analyzes frequencies of residues at each position in groups of sequences and supports the generation of sequence logos. The frequency calculations and program name were initially inspired by VESPA (by Gerry Myers and Bette Korber of Los Alamos National Labs). The logos were inspired by the work of Tom Schneider (of NCI) and Jan Gorodkin and colleagues (DTU, Denmark).. 

File size: 4.3 MB
Platform: Windows All
License: Freeware
Price:FREE
Publisher:Stuart C. Ray

gImageReader 0.8.1

gImageReader 0.8.1 is considered as a flexible and helpful graphical GTK frontend to tesseract-ocr. 
Major Features:

Open images and PDFs
Acquire from scanner
Select the part of the image to recognize
Support for different recognition languages
Side by side comparison of source image and output text
Remove linebreaks in output text
Supports tesseract 3.0

Requirements:

Python

File size: 16.6 MB
Platform: Windows All
License: GPL
Price:FREE
Publisher:Sandro Mani