Builder is a free and open source IDE Integrated Development Environment for Linux OS to create GNOME-based softwares. It is released under GNU General Public License v3.0 and written in C and Python. It comes with auto-completion support, syntax highlighting support, side by side code editors, auto indent, mini-map, Git support, fuzzy text search, build-in software profiler and debugger. You can integrate builder with Autotools, Cargo, CMake, Gradle, Meson, Maven, Make, PHPize, and Waf. You can view the live preview of HTML, Markdown, and reStructuredText, and Sphinx. Some othe important features are building with jhbuild and flatpak runtimes.
Install Builder GNOME IDE on Ubuntu:
It is available as flatpak package on flathub. You need to install and setup flatpak and flathub on your Ubuntu system first. Follow the below link for flatpak and flathub configuration.
After that open your terminal app in Ubuntu and run this Builder GNOME IDE installation command.
flatpak install flathub org.gnome.Builder
Type y and hit enter during the installation to confirm it. then your can open Builder GNOME IDE by entering this command.
flatpak run org.gnome.Builder
Now you can start building Gnome based apps for linux.