Open source software projects (C# ones are active, Delphi - archive)
 

C# is currently the best way for application development under Windows (I think), mature, elegant and efficient, with a large and supportive community (mostly at github).

    Axel Suite Axel Suite is a set of applications for quantum (MOT) inertial accelerometer within Navigator project, developed at Centre for Cold Matter, Imperial College, London, UK.
   Scripthea Scripthea is an open-source Windows application designed to streamline the process of crafting prompts for text-to-image AI generators like Stable Diffusion. It offers a structured environment for building, testing, and refining prompts, making it an invaluable tool for artists, designers, and AI enthusiasts seeking greater control over their creative outputs. Its modular approach allows users to experiment with various combinations, facilitating a more systematic exploration of visual styles and themes.

 

I like Delphi (Embarcadero). Even it has lost its popularity, it was a premium application development instrument for a long time.

  Bee22  v0.9.8 Particle Swarm Optimization (PSO) framework, providing convenient environment for PSO algorithm development. User-friendly for the users as well as for developers. Introducing the idea of blocks of properties.
  Spectrion  v0.9 The main purpose of this program is to provide a friendly environment (framework) to Delphi programmers for developing instrument control and data acquisition software system. The general idea of the software is to have some virtual instruments (called devices) manipulated by scrip generated by "procedures" as well as visual presentation (2D or 3D) of the results.
   Imari  v1.0 Image processing software. The general idea is to split a bitmap image to rectangles (cells), extract features from each one and then recreate the image replacing each cell with SVG element which is parameterized with the features of the bitmap cell.
WMF to SVG convert batcher  v1.0 Software of serial (in batch) WMF (Windows Meta File) to SVG (Scalable Vector Graphic) converter.
    Delaytor  v1.2 Delaytor is designed to control the delay generator DG535 of Stanford Research Systems through a GPIB interface. Delaytor can be used as stand-alone program and used at the same time as COM local-process server from any program language which support this standard.