ORM framework for Delphi with full support for data manipulation, complex and advanced queries, inheritance, polymorphism, and more...

X-Files Components package contains a full set of advanced visual components designed for Delphi 5, 6, 7, 2005, 2006, 2007, 2009, 2010, XE, XE2, XE3, XE4, XE5, XE6, XE7, XE8, 10 Seattle, 10.1 Berlin and C++Builder 5, 6, 2006, 2007, 2009, 2010, XE, XE2, XE3, XE4, XE5, XE6, XE7, XE8, 10 Seattle, 10.1 Berlin, 10.2 Tokyo.

SQL Server Data Access Components (SDAC) is a library of components that provides native connectivity to SQL Server from Delphi, C++Builder, Lazarus (and Free Pascal) for Windows (both 32-bit and 64-bit) and Mac OS X. SDAC-based applications connect to SQL Server directly through OLE DB, which is a native SQL Server interface. SDAC is designed to help programmers develop faster and cleaner SQL Server database applications.

There are quite a few Delphi open source projects on GitHub that can really save you some time. I searched for Delphi on GitHub and then sorted by the Most Starred projects and came up with this Top 10 list. There is some really good stuff here including Awesome Delphi (which is another top list), Delphi IDE color theming projects, an MVC web framework, a REST API client, Open Source Computer Vision Library headers for Delphi, a really powerful custom TreeView component, a unit testing framework, a component for embedding Chrome in your app, and finally the fantastic OmniThreadLibrary.

Open-source seamless access components for Raspberry Pi breakouts.

Feature overview
The TMS LCL HW Pack for Raspberry Pi contains components that offer seamless access to various breakouts.

Components for viewing, navigating, text extracting and editing PDF files.
uses PDFium open-source PDF rendering engine
available for .NET 2 - 4.7
source code included in registered version
royalty free distribution in applications

Communication protocols 3964 and 3964R for .NET.
available for .NET 2 - 4.7
source code included in registered version
royalty free distribution

.NET NFC library for Android.
uses Android NFC API
provides reading, writing and formatting NFC tags
supports NDEF, NFC-A, NFC-V, MIFARE Classic and MIFARE Ultralight tags
source code included in registered version
royalty free distribution in applications

Embarcadero Technologies, a leading provider of software solutions for application and database development, has released an update (R1) to Embarcadero RAD Studio 10.2 Tokyo. It’s an update of Delphi 10.2 Tokyo, C++Builder 10.2 Tokyo and RAD Studio 10.2 Tokyo for active Update Subscription customers. It includes 100s of platform focused enhancements, bug fixes and features.

ZylCPUUsage is a visual Delphi & C++Builder component that diplays the usage level of the processor(s) in a chart. This version is fully functional in Delphi and C++Builder IDE, but it displays a nag dialog (the licensed version will, of course, not have a nag dialog and will not be limited to the IDE). The package includes demo programs for Delphi and C++Builder and a help file with the description of the component.