Delphi and C++ Builder components you can use
to add messaging functionality to your applications.

uses standard Windows SimpleMAPI API
compatible with MS Outlook, Outlook Express, Mozilla Thunderbird and other email clients
available for Delphi/C++ Builder 5 - 10.3 and Lazarus 2.0
source code included in registered version
distributing components in applications is royalty free

Use OCR.NET component to retrieve text from image, for example from scanned paper document.
uses Tesseract OCR engine and Leptonica image processing library
available for .NET 4.0 - 4.8
source code included in registered version
royalty free distribution in applications

Delphi and C++ Builder media recorder component for Android.

uses Android MediaRecorder API
provides audio and video recording
camera component is included
available for Delphi/C++ Builder XE5 - 10.3
source code included in full version
royalty free distribution in applications

Communication protocols 3964 and 3964R for .NET.
contains ComPort.NET serial communication component
supports .NET Framework 4.x
source code included in registered version
royalty free distribution in applications

Components for viewing, navigating, text extracting and editing PDF files.
uses PDFium open-source PDF rendering engine
available for .NET 4.0 - 4.7
source code included in registered version
royalty free distribution in applications

uses ZBar bar code reader library

supports EAN-13/UPC-A, EAN-8, UPC-E, Code 39, Code 93, Code 128, Codabar, PDF417, GS1 DataBar, GS1 DataBar Expanded, Interleaved 2 of 5 and QR Code barcodes
available for .NET 2 - 4.7
source code included in registered version
royalty free distribution in applications

Optical character recognition library for Android. Use OCR.NET for Android to retrieve text from images.

uses Tesseract OCR engine and Leptonica image processing library
supports Android armeabi-v7a devices
source code included in registered version
royalty free distribution in applications

Delphi and C++ Builder utilities library.]

available for Delphi/C++ Builder 7 - 10.3 and Lazarus 2.0
source code included in registered version
royalty free distribution in applications

Delphi library to communicate with attached media and storage devices. Applications can explore devices, send and receive content, and even control devices.

uses standard Windows Portable Devices API
supports Media Transport Protocol (MTP) and Mass Storage Class (MSC) devices
supports Windows 32 and Windows 64
available for Delphi/C++ Builder 5 - 10.3
source code included in registered version
distributing library in applications is royalty free

Delphi and C++ Builder serial communication library for USB connected devices for Android.

uses usb-serial-for-android library
supports FT232R, CDC/ACM (Arduino Uno), CP2102 and CH34x chips
no special root access privileges needed
available for Delphi/C++ Builder XE6 - 10.3
source code included in registered version
royalty free distribution in applications