SymbiFlow - Open source tool
Boards
Artsy
Basys3
https://www.xilinx.com/products/boards-and-kits/1-54wqge.html
Schematics
Simple counter
https://github.com/SymbiFlow/symbiflow-examples/tree/master/xc7/counter_test
PicoSOC
https://github.com/SymbiFlow/symbiflow-examples/tree/master/xc7/picosoc_demo