Free and Open Source CAD and 3D Printing Software

FLOSS CAD software:

https://brlcad.org/
BRL-CAD is a constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system

https://sourceforge.net/projects/librecad/
LibreCAD is a Free Open Source 2D CAD application for Windows, Apple and Linux

https://www.openscad.org/
OpenSCAD is the Programmers Solid 3D CAD Modeller
http://www.openscad.org/downloads.html
http://scorchworks.com/ScorchCAD/scorchcad.html
formats: DXF, STL, OFF

http://solvespace.com/download.pl
SOLVESPACE is a parametric 2D/3D CAD
formats: DXF, EPS, PDF, SVG, HPGL, STEP, STL, OBJ,

https://www.freecadweb.org/
FreeCAD is an Open Source parametric 3D CAD modeler

https://archimedescad.github.io/Archimedes/
Archimedes is Free and Open Source CAD Software

https://chocolatey.org/packages/jwcad
http://www.jwcad.net/
jw_cad is a popular 2D CAD from Japan.

https://github.com/mkeeter/antimony
Antimony is a CAD tool based on LISP.

https://github.com/colah/ImplicitCAD
ImplicitCAD is a CAD program written in Haskell which handles. CSG, bevels, and shells, 2D and 3D and gcode generation.

https://github.com/qcad/qcad
QCAD Community Edition is a 2D CAD for Windows, Linux and Mac.

https://github.com/zecruel/CadZinho
CadZinho is a minimalist CAD program using the Nuklear GUI.


FLOSS 3D Printing Related Software:

http://www.salome-platform.org/downloads/current-version
SALOME is an Open Source Integration Platform for Numerical Analysis

http://www.k-3d.org/
K-3d is 3D Modeling and Animation software.

http://shapesmith.net/
ShapeSmith offers parametric, Open source, 3D modelling in a browser

http://slic3r.org/
Slic3r is an Open Source 3D printing toolbox.
G-code generator for 3D printers. Exports SVG slices.

http://dkobozev.github.io/tatlin/
Tatlin is a multi-platform Gcode and STL viewer for 3D printing

https://sourceforge.net/projects/meshlab/files/meshlab/MeshLab%20v1.3.3/
MeshLab is a mesh processing system for user assisted editing, cleaning, filtering and rendering of large unstructured 3D triangular meshes.

https://www.kicad-pcb.org/
KiCad is an Electronic Design Automation Suite

http://www.wings3d.com/
Wings 3D is an advanced subdivision modeler that is both powerful and easy to use.

https://wdune.ourproject.org/
White Dune is a VRML/X3D editor

http://www.gnuplot.info/
gnuplot is a 2D/3D plotter

http://www.artofillusion.org
Art of Illusion is a free, open source 3D modelling and rendering studio.

http://www.blender.org
Blender is a Free Open Source 3D creation suite.

https://www.libreoffice.org/download
LibreOffice Draw is a vector graphics editor.

http://bricksmith.sourceforge.net/
Bricksmith is a 3D virtual LEGO modeller.

https://github.com/OctoPrint/OctoPrint
OctoPrint provides a web interface for controlling 3D printers.

https://github.com/WEREMSOFT/stl-loader-for-raylib
stl-loader-for-raylib provides functionality to load, manipulate and render STL files on Raylib.


SVG software:

https://github.com/SVG-Edit/svgedit
svg-edit is a powerful SVG editor in a browser

https://github.com/cast-org/cwm-drawtool
CWM Draw Tool is an easy to use drawing tool based on svg-edit

https://wiki.gnome.org/Apps/Dia
Dia is a diagram creation program
formats: EPS, SVG, XFIG, WMF, PNG

https://inkscape.org/
Inkscape is a professional vector graphics editor


2D tools:

https://sourceforge.net/projects/ktoon.berlios/
KToon is a 2D animation toolkit

https://www.synfig.org/
Synfig is an Open Source 2D animation studio

http://www.pencil2d.org/
Pencil2D is a tool to make 2D hand-drawn animations

https://github.com/hlorus/CAD_Sketcher
CAD Sketcher is a constraint-based sketcher addon for Blender that allows creation of precise 2D shapes by defining a set of geometric constraints such as tangent, distance, angle, equal and more.


Other resources:

For more graphics related programs, see http://www.distasis.com/cpp/pbtc.htm#pb3

FLOSS Educational Resources for Internet and Distance Learning

Learning Management Systems, Course Management Systems, Virtual Learning Enviornments, Student Information Systems and other FLOSS online tools that may be useful for Education:

https://jitsi.org/
Recently tried Jitsi and found it very easy to use for online conferences and meetings. If you don't have a browser that works with the software, there's a mobile app option. Want to set up a meeting for your group or class with video and audio support? Check it out. Hosts approx. 75 concurrent users.

https://bigbluebutton.org/
https://bigbluebutton.org/integrations/
BigBlueButton is a web conferencing system that can integrate with various LMS programs. Hosts at least 200 concurrent users.

https://www.mumble.info
https://f-droid.org/packages/se.lublin.mumla/
Mumble is a free, Open Source, low latency, high quality voice chat application. Mumla is an Android app for the Mumble voice conference system. Mumble can handle 1000 concurrent users.

http://llcon.sourceforge.net/
Jamulus software enables musicians to perform real-time jam sessions over the internet. Latest version can handle around 100 concurrent users playing together. Hosts at least 50 concurrent users.

https://sonobus.net/
Sonobus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network. 12 concurrent users maximum.

https://obsproject.com/
Open Broadcaster Software for video recording and live streaming.

https://joinpeertube.org/en_US
Share videos online.

https://mediagoblin.org/
Decentralized media publishing platform.

https://owncast.online/
Live video and web chat.

https://gettogether.community/about/
Open Source event manager for local communities. Share your own events and meetings at the site or try the software to host your own event manager.

https://joinmobilizon.org/en/
Mobilizing tool to organize gatherings.

https://gancio.org/
Shared agenda for local communities.

https://gath.io/
Event sharing platform.

https://appinventor.mit.edu/
Make your own mobile apps to share with others.

https://camstudio.org/
Windows users who want to record their desktop can use CamStudio and share the results online.

https://moodle.org/
Moodle is a learning platform, LMS and course management system (CMS).

https://atutor.github.io/
ATutor is an Open Source LMS, used to develop and manage online courses, and to create and distribute interoperable elearning content.

https://github.com/instructure/canvas-lms/wiki
Canvas is a modern, Open Source LMS released under the AGPLv3 license.

https://sourceforge.net/projects/ilias/
ILIAS is a web base learning management system (LMS, VLE, CMS)

https://github.com/claroline/Claroline
https://claroline.net/
Claroline is a collaborative eLearning and eWorking platform (learning management system) released under the GPL open-source license

https://olat.org/
OLAT is a Learning Management System that supports any kind of online learning, teaching, and tutoring with few educational restrictions

https://chamilo.org/en/
Chamilo is e-learning and collaboration software

https://www.dokeos.com/
Dokeos is a LMS, CMS and e-learning suite

https://github.com/pupilfirst/pupilfirst
Pupilfirst is a LMS

https://www.sakailms.org/
Sakai is a free, community source, educational software platform designed to support teaching, research and collaboration, LMS and CMS

https://www.xerte.org.uk/index.php/en/
E-learning development environment.

https://gibbonedu.org/
Gibbon is a flexible, open source school management platform

https://safeexambrowser.org/news_en.html
SEB, the Safe Exam Browser, can be used in conjunction with
various LMS software.

https://elgg.org/
Elgg is an award-winning Open Source social networking engine that provides a robust framework on which to build all kinds of social environments, from a campus wide social network for your university, school or college or an internal collaborative platform for your organization

https://tcexam.org/
TCExam is a Open Source system for electronic exams (also know as CBA - Computer-Based Assessment, CBT - Computer-Based Testing or e-exam) that enables educators and trainers to author, schedule, deliver and report on quizzes, tests and exams

https://github.com/jkitchin/techela-emacs
Techela, Technology enhanced learning and assessment, is a framework for teaching courses and provides a way to distribute, collect, grade, and return digital assignments

https://projectfedena.org/
Project Fedena is a Free and Open Source school management application that has more features than a student information system

https://www.edutracsis.com/
https://sourceforge.net/projects/edutrac/
eduTrac SIS is a Free and Open Source student information system for higher education that allows educational institutions to manage faculty, staff, students, courses, course registrations and more

https://www.rosariosis.org/
RosarioSIS is a Free and Open Source Student Information System (SIS), School Management System (SMS) and School ERP

https://opensis.com/
OpenSIS is the best user friendly open source student information system plus full scale school management and administrative system

https://en.wikipedia.org/wiki/SchoolTool
SchoolTool is a GPL licensed, free student information system for schools around the world

https://sourceforge.net/projects/fet-timetabling/
FET is free timetable software for schools

http://richtech.ca/
Open Admin for Schools is a school administration program

https://github.com/inverse-inc/sogo
Groupware for calendar, e-mail and address book access.

https://github.com/veyon/veyon
Veyon (Virtual Eye On Networks, formerly iTALC) is free and open source software for computer monitoring and classroom management supporting Linux and Windows

https://www.sparkleshare.org/
SparkleShare is an Open Source cloud storage and file synchronization client app

https://github.com/Sankore/Sankore-3.1
Open-Sankore is an Open Source interactive whiteboard

https://openmeetings.apache.org/
OpenMeetings is software used for presenting, online training, web conferencing, collaborative whiteboard drawing and document editing and user desktop sharing.

https://gobby.github.io/
Gobby is a collaborative editor supporting multiple documents in one session and a multi-user chat

https://www.libreoffice.org/download/libreoffice-online/
LibreOffice Online provides collaborative editing through a web browser.

https://secure.plaimi.net/games/quizbot.html
Simple quizbot for IRC.

https://wordpress.com/blog/2020/08/06/improve-your-remote-collaboration-with-p2/
P2 is currently Software As A Service, but a self-host Open Source version is in the works.

https://code.google.com/archive/p/gpapers/
gPapers is an Open Source digital library manager. Think of it as an iTunes for your PDFs.