fltk/fltk

FLTK - Fast Light Tool Kit - https://github.com/fltk/fltk - cross platform GUI development observed · 2026-08-28

github.com/fltk/fltk · homepage · C++ · NOASSERTION (other) observed · 2026-08-28

Health v2 · maintenance only

89/100

Activity 99
Release rhythm 69
Longevity 100

Flags: no_license

How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.

gap_med: 54
age_days: 2906
days_rel: 130
days_push: 7
n_releases_24m: 8

Full methodology

Adoption not part of the score

2264 stars · 340 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

FLTK (Fast Light Tool Kit) is a cross-platform C++ GUI toolkit for Linux (X11/Wayland), Windows, and macOS, providing lightweight, modular GUI functionality with OpenGL 3D support and GLUT emulation. It includes FLUID, a UI builder, and is licensed under LGPL with static-linking exceptions.

Use cases

build a cross-platform desktop gui application in c++
create lightweight native windows without heavy dependencies
add opengl 3d rendering to a c++ desktop app
statically link a gui toolkit into a small binary
design ui layouts visually with a gui builder
port a gui app across linux, windows, and macos

When to choose

you need a small, fast, statically-linkable C++ GUI toolkit
you want cross-platform desktop support including X11 and Wayland
you need OpenGL integration or GLUT emulation
you prefer minimal dependencies and a mature, long-stable API

When to avoid

you need modern theming, touch, or mobile support
you want a widget toolkit with rich built-in controls like data grids or web views
you prefer declarative or reactive UI frameworks
you need first-class accessibility support

Facets

library · maturity stable

ui-components graphics gui cross-platform desktop-applications graphics developer-tools windows cpp cross-platform gui-toolkit opengl fluid-ui-builder x11 wayland static-linking lightweight linux macos

5 sources

readme: https://github.com/fltk/fltk · fetched 2026-08-28 · 6615fcf8eea0
homepage: https://www.fltk.org · fetched 2026-08-29 · 6c4c1b3a2180
site_page: https://www.fltk.org/documentation.php · fetched 2026-08-29 · e4d4cf1ad7f1
site_page: https://www.fltk.org/articles.php · fetched 2026-08-29 · fda7689a02eb
site_page: https://www.fltk.org/str.php · fetched 2026-08-29 · a7c26f73177c

Member repositories

Repository	Role	Health v2
fltk/fltk	main	89

For agents

markdown · JSON · MCP: product_card(name="fltk/fltk")

Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem