I want to share this site to you that has a lot of hobby projects or DO it yourself projects which involved electronics in different applications...
Here are some of the Lists of Projects:
Pure Class A Headphone Amplifier
20 Watts Automotive Power Amplifier
Car Parking Sensor
Wideband TV Amplifier
300mW FM Transmitter
PLL FM Transmitter
Stereo Encoder Oversampling for FM TRansmitter
FM Telephone Transmitter
Ringing Phone Light Flashers
VO Fuel Controller
I2C Temperature Sensor
ESR Meter
Oxygen Sensor Simulator
Fluid Level Detector
Audio Clipping Indicator
RF Sensing Alarm
UHF Amplifier for TV Transmitter
Six LED Bar Power Indicator
Portable Mixers
and a lot more....
Complete with parts lists and notes for implementations.
You may better ask EFY magazine about which software they have used. Because majority of the ciruits on the site refred by "Gundam" are from scanned from EFY and other pupular magazines. I have EFY collection right from 1990 to till date. Too the site has a huge collection of Circuits published in old Electronic project books like "ETI top" which is published in late 70's
Currently the circuits the you seeing in the sites are compilation of circuitry that are useful and the possibility to built is high.
Sooner I will post an original design, which will be first seen in the site. And the software that I will be using in schematic capturing is either CADSTAR or PADS LOGIC or EXPEDITION.