Inkscape

Powerful open-source vector graphics editor for creating illustrations, logos, and complex artwork

Quickly create professional marketing materials with easy-to-use templates and extensive editing features

Free professional-grade drafting solution for architects and small firms, with customizable layouts and labels

Advanced 3D modeling and animation suite tailored for fast, professional film, design and visualization workflows

Professional show-control suite for creating tightly timed, high-end multimedia performances with audio, video, and MIDI

A free analog circuit simulator with powerful SPICE-based tools for schematic design and waveform analysis

Free, open-source vector design suite offering professional-grade SVG tools for scalable, polished artwork