cFS vs pim

cFS

The Core Flight System (cFS) (by nasa)

pim

Source code for the book: Patterns in the Machine: A Software Engineering Guide to Embedded Development (by johnttaylor)

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cFS		pim
	Project
8	Mentions	1
684	Stars	38
3.4%	Growth	-
7.4	Activity	4.4
14 days ago	Latest Commit	about 1 year ago
CMake	Language	C
Apache License 2.0	License	-

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.

cFS

Posts with mentions or reviews of cFS. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-24.

NASA CoreFlight System (CFS)
1 project | news.ycombinator.com | 23 May 2023
Examples of excellently-written projects.
4 projects | /r/embedded | 24 Mar 2023
[ANN] NASA's Ogma -- now with FPrime support
7 projects | /r/haskell | 23 Mar 2023

[4] https://github.com/nasa/cFS
C programming jobs?
1 project | /r/C_Programming | 10 Jan 2023

I definitely recommend looking at https://github.com/nasa/cFS for some great pure C coding.
Resources for Space sector embedded programming
6 projects | /r/embedded | 30 Jun 2022

Nowadays there's a trend towards openness and reusability. There's frameworks like the NASA Core Flight System (cFS) and the NASA JPL F Prime framework. There's also workshops where all of us flight software engineers get together and discuss new research, trends etc: https://www.youtube.com/c/FlightSoftwareWorkshop
Ask HN: What open source projects go to space?
4 projects | news.ycombinator.com | 23 Feb 2022

Core Flight System (cFS) https://github.com/nasa/cFS
NASA has a lot of open source projects including a bunch that don't "go to space" but are used in space related projects (check each project for contributor guidelines):
https://github.com/nasa/openmct - web based mission control software
ANN: NASA's Ogma
4 projects | /r/haskell | 3 Dec 2021

Your best bet is probably to read the documentation of the project itself, as well as documentation from the associated projects FRET, Copilot (https://copilot-language.github.io/documentation.html, https://ntrs.nasa.gov/citations/20200003164), and cFS (https://github.com/nasa/cFS).

pim

Posts with mentions or reviews of pim. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-24.

Examples of excellently-written projects.
4 projects | /r/embedded | 24 Mar 2023

What are some alternatives?

When comparing cFS and pim you can also consider the following projects:

fprime - F´ - A flight software and embedded systems framework

IMUtility - A Safety-Critical Utility Code

Open MCT - A web based mission control framework.

zephyr - Primary Git Repository for the Zephyr Project. Zephyr is a new generation, scalable, optimized, secure RTOS for multiple hardware architectures.

copilot - A stream-based runtime-verification framework for generating hard real-time C code.

luos_engine - Open-source and real-time orchestrator for cyber-physical-systems, to easily design, test and deploy embedded applications and digital twins.

kubos - An open source platform for satellites

ogma

fret - A framework for the elicitation, specification, formalization and understanding of requirements.

trick - Trick Simulation Environment. Trick provides a common set of simulation capabilities and utilities to build simulations automatically.