Libre Arts covers free and open source creative software, including graphics, audio, CAD and related Linux tools.
HN commenters cite it as a source on topics like SVG mesh gradients, DWG support in free software, and the CLAP audio plugin standard.
LibreCAD is a fork [0] of QCAD Community Edition. It looks very similar, but it is actually a separate piece of software.
The biggest difference I see between these two is UI and the pace of development. LibreCAD is still being worked on, but the latest stable release was in 2016. Last patch for QCAD has been released four days ago.
Personally, I prefer QCAD to LibreCAD. Both are quirky to use, but QCAD is at least a little bit less quirky. If you are coming from AutoCAD, then both will be equally confusing.
[0] Maybe not literally, README file available in LibreCAD repo declares that "LibreCAD is a 2D CAD drawing tool based on the community edition of QCAD." On the other hand, Libre Arts article [1] calls it fork.
[1] https://librearts.org/2013/03/librecad-vs-qcad/
There has been quite a lot of IoT automation / rule engine stuff done in NoFlo in the last couple of companies I’ve worked at, but obviously I can’t really go into specifics there.
Then there was this startup way back when:
https://www.cloudamqp.com/blog/2017-05-31-work-queues-in-rabbitmq-for-resource-intensive-tasks.html
https://librearts.org/2014/10/artificial-intelligence-designs-websites-uses-open-technology-stack/
On the front-end side, Flowhub uses NoFlo for state management, a bit similarly to how you’d use Redux:
https://github.com/noflo/noflo-ui
SolveSpace[0] is a free & opensource 2D/3D CAD app based on own solid geometry kernel & geometric constraints solver (`libslvs`).[1]
`libslvs` partially used for FreeCAD (Assembly3 Workbench) & Blender (Geometry Sketcher) add-ons.[2]
Try latest SolveSpace 3.x 'nightly' builds for Linux, macOS & Windows.[3]
[0] https://solvespace.com
[1] https://librearts.org/2013/08/solvespace-released-under-gpl/
[2] https://twitter.com/app4soft/status/1464273608465948682
[3] https://git.io/SolveSpace3x
This is not supported in SVG. There was a Mesh Gradient feature planned for SVG v2.0, but AFAIK that was removed from the draft. It's a shame. Here is an article discussing that. (2018, mind you)
https://librearts.org/2018/05/gradient-meshes-and-hatching-to-be-removed-from-svg-2-0/
EDIT: I assumed this is SVG renderer, but now i think it may not be bound by SVG limitations.
A more even-handed write up at librearts:
https://librearts.org/2022/06/introducing-clap/
and from the same author, just last week, an LWN overview of CLAP:
https://lwn.net/Articles/893048/
and from the same author a few weeks before that, and overview of the state of audio plugin APIs with a particular focus on the Linux situation:
https://lwn.net/Articles/890272/
Still struggling from this famous fallout:
https://librearts.org/2012/01/whats-up-with-dwg-adoption-in-free-software/
I'm the maintainer, the FSF owns the code, and I'm very fine that it's GPLv3. Others not so, but we don't care. GPLv3 is the only possibility.