Open Source C Drawing Software for Linux

Tux Paint is a free, award-winning drawing program originally created for children ages 3 to 12, but enjoyed by all! It combines an easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who guides children as they use the program. You're presented with a blank canvas and a variety of drawing tools to help them be creative. Along with paintbrush, shapes and text, Tux Paint includes a "stamp" feature to add pre-drawn or photographic imagery to pictures, and a set of "magic tools" that provide filter effects (like blur, tint and waves) and interesting drawing tools (like train tracks, bubbles and grass). Tux Paint includes a collection of "starter" images, both coloring-book style and photo-realistic, and a large collections of stamps are available as a separate download. Additional content can be added by parents & teachers, or downloaded from 3rd parties. Tux Paint is available for Windows, macOS, Android, Linux, & Haiku operating systems, among others.

Dia Diagram Editor is free Open Source drawing software for Windows, Mac OS X and Linux. Dia supports more than 30 different diagram types like flowcharts, network diagrams, database models. More than a thousand readymade objects help to draw professional diagrams. Dia can read and write a number of different raster and vector image formats. Software developers and database specialists can use Dia as a CASE tool to generate code skeletons from their drawings. Dia can be scripted and extended using Python.

Tgif is a vector-based 2D drawing tool. It's also a hyper-structured-graphics browser on the web.

GUI and command line tools for advanced users and administrators: wxdkdraw - Minimalistic drawing application for use with LaTeX, wxd2lat - Convert wxdkdraw files to LaTeX, bitmap2pp - Convert PNG/JPEG/TIFF/NetPBM to (E)PS or PDF, fig2lat - Convert XFig files to LaTeX, htmlbook - publish HTML like a book, dkcpre - C debugging and tracing preprocessor, itadmin - manage your IT using a MySQL/MariaDB database, dk-fic - file integrity checker, dk-ls - list files, output column order is configurable, dk-cat, dk-sort, dk-lines - text tools for *x and Windows, dk-send, dk-recv - transmit data stream, dk-t2h, dk-t2l - text to HTML or LaTeX conversion.

Skencil is a vector drawing program. It's written almost completely in python for flexibilty with some modules written in C for speed.

A UNIX/X11 circuit drawing application with schematic capture. Features user-definable parts libraries and fully hierarchical SPICE netlist generation.

Vectronics is a way to share schematics. It makes quick svg images that can be displayed in a browser and reopened and reedited as a schematic. Hyperlinks can also be added to link to data sheets or source code. It is a simple xml based drawing program .