Top 8 C++ Atmel Projects

Marlin

755 15,888 9.8 C++

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.

Project mention: Why Prusa is floundering, and how you can avoid their fate | news.ycombinator.com | 2023-12-26

There is _a lot_ wrong with Marlin. It is a complex codebase, full with ancient artefacts, litterred with preprocessor ifdefs every 2-3 lines of code, dynamic includes in the middle of CPP files, etc[1]. It's about as unreadable as C++ code gets--well, I guess it's not template metaprogramming.
Klipper by contrast is a breeze to read through[2].
I am very grateful for Marlin, for all of reprap, and everyone who has contributed to it. But saying there is nothing wrong with it is straight up misguided.
[1]: https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/M...
[2]: https://github.com/Klipper3d/klipper/blob/master/src/lcd_hd4...

MiniCore

8 937 7.3 C++

Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB

Project mention: Barebone ATmega328 project at 8Mhz | /r/arduino | 2023-05-23

WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
MightyCore

5 618 6.9 C++

Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535
MicroCore

2 518 4.7 C++

A light-weight Arduino hardware package for ATtiny13

Project mention: Arduino Nano as ISP wrong signature error | /r/ArduinoHelp | 2023-04-25

Installed MicroCore 2.3.0 and setup following settings in 'Tools" tab:

ADVi3pp

5 241 8.8 C++

ADVi3++, an alternative and better firmware for Wanhao i3 Plus printers and clones. Fork of Marlin Firmware.

Project mention: Questions about replacing printer firmware | /r/3Dprinting | 2023-11-13

I found this website which goes into a lot of detail about i3 clones, and the author links to his own firmware, ADVi3++, which is advertised for i3 clones.

Bloom

4 61 8.8 C++

A debug interface for AVR-based embedded systems development on GNU/Linux. (by bloombloombloom)
Marlin

2 40 0.0 C++

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. | Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine. (by thisiskeithb)
InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
eeprom-programmer

3 9 0.0 C++

An Arduino Nano sketch and schematic for an Atmel 28cx programmer. (by yoppeh)

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).