Digital Electronics Deeds : IDEAS, CIRCUITS, PROJECTS, EDUCATION IN DIGITAL ELECTRONICS
Download: Deeds: Digital Electronics Education and Design Suite
Examples:
NSLadder: A complete PLC manager based on the Ladder diagram
Download: NSLadder: Ladder editor and debugger
Examples:
Intel FPGAs & Programmable Devices and Solutions
Download: Intel® Quartus® II Web Edition Design Software Version 13.0sp1 for Windows
Examples (Verilog Projects):