MeowCAD is described as 'Like other cloud-based EDAs, updates to schematics and boards communicate back to MeowCADs central server and are saved persistently, giving the ability to work on electronics projects anywhere there's a web browser and internet connection' and is a Electronic Design Automation Tool in the Education & Reference category. There are seven alternatives to MeowCAD, not only websites but also apps for Windows, Linux and Mac. The best alternative is Fritzing. It's not free, so if you're looking for a free alternative, you could try EasyEDA or PCBWeb. Other great sites and apps similar to MeowCAD are Autodesk EAGLE (Paid), Upverter (Paid), LochMaster (Paid) and PCB Elegance (Free, Open Source).
PCBWeb is a 100% free Windows desktop CAD application for designing and manufacturing electronics hardware. Features include schematic capture, PCB Layout with gerber output, and Bill of Materials manager.
PCB Elegance is a suite of circuit board design tools for Windows. Including schematic capture, board layout, and manufacturing file generation. First released in 1998, it was proprietary software until 2012, when it was released as open source software under the GPL.