OmniThreadLibrary is a powerful threading library for Delphi. OmniThreadLibrary's main "selling" points (besides the prices, of course ;) are power, simplicity, and openess. With just few lines of code, you can set up multiple threads, send messages between them, process Windows messages and more. OmniThreadLibrary doesn't limit you in any way - if it is not powerfull enough for you, you can ignore any part of its "smartness" and replace it with your own code.

FreeEsVclComponents - a free library of VCL components for Delphi and C++Builder.
There are new controls and components, classes to improve the appearance and to better user experience.
Components has best transparency support, do not flicker.

DIXml is an embedded XML, XSLT, and EXSLT processing library for Delphi (Embarcadero / CodeGear / Borland). It is build on the libxml2, libxslt and libexslt libraries. However, DIXml requires no DLLs or any other external files whatsoever. All required code is compiled completely into the application's executable. DIXml is the most feature-complete XML and XSLT solution for Delphi.

Delphi and C++ Builder component for serial communication for Windows.
communication with devices connected to serial port
easy of use and very powerful
uses multithreading and overlapping for maximum performance
available for Delphi/C++ Builder 5 - 12 and Lazarus 2.2.6
source code included in registered version
royalty free distribution in applications

Delphi and C++ Builder communication components. Protocols 3964 and 3964R are implemented.
available for Delphi/C++ Builder 5 - 12 and Lazarus 2.2.6
source code included in registered version
royalty free distribution

This is a Delphi library for interacting with the Telegram Bot API.
It provides a set of functions to perform various actions using the
Telegram Bot platform.

JVCL is a library of over 600 Delphi visual and non-visual Delphi/C++Builder components. It supports Delphi/C++Builder 6 and newer.

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.

SAPIEN is out to make Windows administrative tasks simpler. We offer best-of-class script editors, authoritative PowerShell books, training videos, supportive communities, and real-world training.

With DA-FormMaker you quickly and easily create HTML Forms . The form data are sent with a single click to your e-mail address. You do not need deep knowledge of HTML and CGI webspace! Colors, fields, all settings can be configured easily from program interface.