C++Builder

JVCL is a library of over 600 Delphi visual and non-visual Delphi/C++Builder components.

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The JEDI Code Library (JCL) consists of a set of thoroughly tested and fully documented utility functions and non-visual classes which can be instantly reused in your Delphi and C++ Builder projects.

Abbrevia is a compression toolkit for Delphi, C++Builder, Kylix and Free Pascal.Supported on platforms: Windows, Android, OS X, iOS.

Utility routines and classes for Delphi and CBuilder. It includes bar codes, sorting, money routines, logging, high precision math...Supported on platforms: Windows

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doctest is a new C++ testing framework but is by far the fastest both in compile times (by orders of magnitude) and runtime compared to other feature-rich alternatives. It brings the ability of compiled languages such as D / Rust / Nim to have tests written directly in the production code thanks to a fast, transparent and flexible test runner with a clean interface.

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Google's C++ test framework.

EasyBMP is a simple, cross-platform, open source (revised BSD) C++ library designed for easily reading, writing, and modifying Windows bitmap (BMP) image files.