Inkscape is a marvellous softwate to make vertorial graphics, it use SVG open format, a standard than most software manage, including web browsers.
- Available for multiple operating systems.
- Very stable and light.
- Compatible with other software.
- Manage PDF files.
- There is a lot of documentation to take advantage of the software.
You can see some screenshots to give you an idea of its possibilities.
Sometime ago, I design a forniture for my home in few minutes.