FLTK vs gtkmm

FLTK

FLTK - Fast Light Tool Kit - https://github.com/fltk/fltk - cross platform GUI development (by fltk)

GUI

Source Code

fltk.org

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gtkmm

Read-only mirror of https://gitlab.gnome.org/GNOME/gtkmm (by GNOME)

GUI

Source Code

gitlab.gnome.org

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FLTK		gtkmm
	Project
18	Mentions	1
1,502	Stars	150
5.7%	Growth	0.0%
9.8	Activity	8.3
4 days ago	Latest Commit	8 days ago
C++	Language	Scheme
GNU General Public License v3.0 or later	License	GNU Lesser General Public License v3.0 only

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

FLTK

Posts with mentions or reviews of FLTK. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-15.

What frameworks exist that support both MacOS and Windows?
1 project | /r/learnprogramming | 1 Jun 2023

Another dark horse is FLTK: https://www.fltk.org/. For utilities this might be your best choice, especially because static linking is supported. This is mostly a C++ solution but there are bindings to other solutions.
Is there no simple GUI library for pure C?
4 projects | /r/C_Programming | 15 May 2023

Fl_Flex (shameless plug!) is now officially in upstream FLTK since 1.4 for a "flexbox style" layout manager.
Why is there no good and easy gui library available for C++ for desktop?
1 project | /r/cpp_questions | 3 May 2023

Go ahead and sell an FLTK product then. I'm sure you go to https://www.fltk.org/ and think those GUI's look awesome you delusional moron
[Cpp] Une assez grande liste de bibliothèques graphiques C ++
22 projects | /r/enfrancais | 14 Feb 2023

FLTK
GUI libraries or frameworks?
3 projects | /r/Cplusplus | 14 Feb 2023

A few examples: Dear ImGui, SFML, FLTK. Probably even Tk could be used.
It's old school
1 project | /r/ProgrammerHumor | 8 Feb 2023
The state of Rust GUI libraries
9 projects | dev.to | 17 Aug 2022

FLTK (Fast Light Toolkit) is a lightweight, cross-platform supported toolkit for building GUIs. FLTK is supported on Windows, macOS, and UNIX systems and was originally built for C++. If you use the FLTK toolkit to create a GUI application, the application looks the same on all supported operating systems.
Add the Wayland platform to FLTK 1.4
1 project | news.ycombinator.com | 26 May 2022
Are there any low-level library options for creating desktop apps?
6 projects | /r/csharp | 6 May 2022

There are a lot of options and they're not that hard to find... Qt, wxWidgets, FLTK, IUP come immediately to mind.
Looking for a cross-platform solution to my problem
2 projects | /r/cpp | 6 Feb 2022

FLTK. It's a cross-platform C++ GUI toolkit for UNIX®/Linux® (X11), Microsoft® Windows®, and MacOS® X.

gtkmm

Posts with mentions or reviews of gtkmm. We have used some of these posts to build our list of alternatives and similar projects.

GTKmm4 Define a widget "template" once in a UI file, and reuse it and customize in code multiple times.
1 project | /r/GTK | 3 Jun 2023

I've tried looking around for how to make a custom GTK widget using GTKmm4 in C++, and I am finding some examples (which, however, do not use templates), like this one, which is something that the official GTKmm documentation also mentions. The idea is that then you can use the Gtk::Builder get_widget_derived method to instantiate a custom object that inherits a standard GTK4 widget class.