This a simple circuit demonstrate the Tiny family high speed PWM capabilities to produce a sinewave output. It was also incorporated functions to play Piano Key Tones using sinewave waveform, as a smooth and clean sound as the ones produced by cords.The sinewaves produces are better in low frequencies. source

A two LED flasher is about as simple as it gets.A simple LED flasher is a good project to get started with AVRs. This ATtiny13 based circuit alternately flashes 2 LEDs (or however you want them flashed). Note: Circuit and firmware now available.source

CodeVisionAVR V2 is a High Performance ANSI C Compiler, Integrated Development Environment,Automatic Program Generator and In-System Programmer for the Atmel AVR family of microcontrollers. Some CodeVisionAVR V2 Standard Features Application that runs under Windows 95, 98, Me, NT 4.0, 2000, XP and Vista 32bit Easy to use Integrated Development Environment and ANSI C compatible Compiler [...]

AtmanAvr is a high performance C/C++ compiler IDE for the Atmel AVR family of microcontrollers providing visual and modular programming that works with the GCC compiler. AtmanAvr supports different Project Types for the production of C/C++ executable programs and libraries. An AtmanAvr workspace can contain multiple projects and their Debug and Release configurations. The AtmanAvr [...]

BASCOM-8051 is the Windows BASIC COMPILER for the 8051 family. It is designed to run on W95/W98NT/XP and has all the features of BASCOM LT. In addition it has full support for arrays and the single floating point type. Here are some features Structured BASIC with labels. Structured programming with IF-THEN-ELSE-END IF, DO-LOOP, WHILE-WEND, SELECT- [...]