The Google Firebase Cloud Database is used in many mobile and web applications worldwide and there are well-documented libraries for many languages and platforms. For Delphi, the cross-platform library FB4D supports the Firestore Database, the Firebase Realtime Database, the Firebase Storage (for file storage), Firebase Functions (for calling server functions), and Vision ML. For authentication, FB4D currently supports email/password authentication and anonymous login.

Delphi and C++ Builder optical character recognition component.

Uses Tesseract OCR engine and Leptonica image library
Supports Delphi/C++ Builder 5 - 12 and Lazarus 2.2.6
Source code included in registered version
Royalty free distribution in applications

YuZip is a Delphi library to create, open, extract from, and modify ZIP archives with multiple algorithms for compression (deflate, bzip2, LZMA, PPMd, XZ, zStandard) and encryption (AES, PKWARE).

CompressionMaster Suite is the most advanced data compression library available for Delphi and C++ Builder. The Suite includes three independent data compression products: Easy Compression Library, FlexCompress and Delphi Zip component ZipForge. Compression Master is a complete solution for developing applications with data compression and encryption capabilities.

Delphi and C++ Builder library for creating, processing and rendering PDF documents.

Features

Uses PdfBox-Android library
Available for Delphi/C++ Builder 10.4 - 12
Royalty free distribution in applications

Delphi and C++ Builder optical barcode recognition library for Android.

uses ZXing library
supports UPC-A, UPC-E, EAN-8, EAN-13, Code 39, Code 93, Code 128, Codabar, ITF, RSS-14, RSS-Expanded, QR Code, Data Matrix, Aztec and PDF 417 barcodes
available for Delphi/C++ Builder 10.4 - 12
source code included in registered version
royalty free distribution in applications

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.