Open Source C Software for NetBSD

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.

gPhoto is a program and library framework that lets users download pictures from their digital cameras. The libgphoto2 library gives you access to hundreds of models of digital cameras on several platforms. GIT repo and Issue tracker lives at https://github.com/gphoto/ these days.

Developer's Image Library (DevIL) is a cross-platform image library utilizing a simple syntax to load, save, convert, manipulate, filter and display a variety of images with ease.

fre:ac is a free audio converter and CD ripper for various formats and encoders. It features MP3, MP4/M4A, WMA, Ogg Vorbis, FLAC, AAC, and Bonk format support, integrates freedb/CDDB, CDText and ID3v2 tagging and is available in several languages.

ttyrpld is a multi-OS kernel-level TTY keylogger and screenlogger with (a)synchronous replay support. It runs on Linux, Solaris, FreeBSD, NetBSD and OpenBSD.

Mini vMac emulates a Macintosh Plus, one of the earliest of Macintosh computers. It can run old Macintosh software that otherwise couldn't be used on recent machines. (So far available for MacOS, Windows, and X)

NetSurf is an open-source web browser for RISC OS and UNIX-like operating systems. Its aim is to bring HTML 4 and CSS technologies to the RISC OS platform.

yoDownet is an open-source && free graphical download manager project that tries to be simple and minimal, also for sake of humor it's described as "The Previous Generation Graphical Download Manager".