SumatraPDF

One of the lightest PDF document viewers

PrimoPDF

Transform text documents into PDF files

Bullzip PDF Printer

Easily create PDFs by simulating that you are printing a document

Corel PDF Fusion

Create and edit PDF documents with this complete tool by Corel

Cometdocs

Simple file converter

Simpo PDF Password Remover

Easily remove passwords from PDF files

JPGasPDF

An easy and quick way to create PDF files

Flipping PDF Reader

A PDF viewer with flip page effects

My PDF Converter

Convert documents into PDF format

PaperScan

Improve your scanning quality

Wide Angle PDF Converter

Converter from PDF to Word and other formats

CleverPDF

A complete suite of tools to work with PDF files

Briss

Cut PDF documents to view them on your eBook

PDF Studio

Complete PDF document editor

First PDF

PDF file converter

Evince

A brilliant open source PDF and PostScript viewer

Proteus

Electronic circuit and microprocessor simulator

PSpice

Very good circuit analysis software

Logisim

Learn everything to be known about digital circuits

NI Multisim

The best software to design PCBs

PCB

Carry out your own electronic designs with this software

Livewire

Design and simulate electronic circuits

LabVIEW

Development environment for industrial applications

Resistance Calculator

Calculate the value of a resistance according to its casing's color

OrCAD

The best tool to design PCBs

PCB Wizard

Software to design circuit boards

SEE Electrical LT

Create electricity projects and their documentation

ProfiCAD

Simple tool with which you can build your electric circuits

KiCad

Tool for creating electrical diagrams and printed circuit boards

Zelscope

Have a complete oscilloscope on your desktop