Unit conversion program that will convert the most popular units of distance, temperature, volume, time, speed, mass, power, density, pressure, energy and many others.
Convert just about anything to anything else online.
Engineering Power Tools
Engineering programs and data tables (metric and U.S. units).
European laws and standardization regarding organization, engineering, maintenance, working environment, etc. (Dutch).
Information, software and tools for mechanical engineering.
The free encyclopedia that anyone can edit.
Metalworking, tools and stuff:
CNC G- and M-codes, common for most machines.
Dimensions of some of the most common collets.
Dimensions of some of the most common tapers.
Specifications of (all?) International Thread Standards.
Online datasheet source for electronic components and semiconductors.
Proton Development Suite
Basic compiler from the British company Crownhill
The free Lite Edition has a restriction of 50 lines of valid BASIC code and only supports the 12C508, 12F675, 16F628A and 16F877 PIC microcontrollers.
PIC programming software for Windows which can be used with the GalvaWisp ICSP programmer.
Easy to use program for designing printed circuit boards.
Includes a schematic editor, layout editer and autorouter.
The free Light-version is limited to 1 schematic sheet, 2 signal layers and 100x80mm routing area.
Freeware printed circuit board layout editor.
Freeware program to draw circuit diagrams.
Technical information and downloads