LibXL is a library that can read and write Excel files. It doesn't require Microsoft Excel and .NET framework, combines an easy to use and powerful features. Library can be used to

Generate a new spreadsheet from scratch
Extract data from an existing spreadsheet
Edit an existing spreadsheet

PDF Mosaic allows you to create, merge and modify PDF documents. Simple yet powerful API will help you to process PDF documents with ease. PDF Mosaic does not require any third-party applications or libraries to generate or modify PDF documents. PDF Mosaic is a C# library, it is created for .NET Framework 2.0 and later.

HTML Editor Library - WYSIWYG HTML Editor for Delphi. Yes, it is real (and currently the only one) WYSIWYG and 100% native HTML editor written in Delphi.

Basic features
WYSIWYG editing.
Does not use IE or other libraries (100% native Delphi code).
Supports all Delphi versions from Delphi 5 to Delphi 10.2 Tokyo.
VCL (Win32/64) FMX (Windows / OSX / Android / iOS / Linux)
Full support for touch-screen devices - gestures, text selection (Windows Tablets/Screens, iOS, Android, OSX)
Smooth scrolling on Android and iOS.
Unicode support for Delphi 6 - 2007 (requires TNTUnicode).

Flexible, reliable and mature Zip/Unzip library, with a 15-year track record. The first commercial library for .NET, it has been continually improved and updated ever since. Backed by a responsive support and development team whose sole ambition is your complete satisfaction.

The richest feature set with over 200 capabilities
Supports the latest zip file format standards
Used and trusted by Microsoft in their server products

Hierarchical dimensions support. HierCube library supports all types of hierarchical dimensions possible in Data Warehouses. It's possible to combine several flat dimensions into single hierarchical one (support of "snowflake" schema). Also you can define a hierarchical dimension using "Parent-Child" relation in the dimension table. At this time the library is the only "desktop" product supporting "snowflake" schema. Easy and time-proved VCL OLAP components for creating OLAP applications in Delphi and RAD Studio. Very easy to configure and get up and running.

Delphi PDF library for iOS.

uses PDFKit framework
available for Delphi XE8 - 10.2
source code included in registered version
royalty free distribution in applications

Highcharts is a battle-tested SVG-based, multi-platform charting library that has been actively developed since 2009. It makes it easy to add interactive, mobile-optimized charts to your web and mobile projects. It features robust documentation, advanced responsiveness and industry-leading accessibility support.

IronBarcode allows developers to read & write Barcodes and QR Codes within .Net Applications & websites. Reading or writing barcodes onkly requires a single line of code with Iron Barcode. The .Net Barcode Library reads and writes most Barcode and QR standards. These include code 39/93/128, UPC A/E, EAN 8/13, ITF, RSS 14 / Expanded, Databar, CodaBar, Aztec, Data Matrix, MaxiCode, PDF417, MSI, Plessey, USPS, and QR. The barcode result data includes type, text, binary data, page, and image file.