LiteSQL is a codegenerator and C++ library that integrates C++ objects tightly to relational database and thus provides an object persistence layer. LiteSQL supports SQLite3, PostgreSQL, MySQL and oracle as backends.
QtPersistence is a project to create an ORM library for Qt Users. It’s loosely based on ideas from both the Active Record and Data Mapper Ruby ORM projects.
The Chilon Library is a C++0x utility library. The most advanced parts are a command-line argument parser and a parser generator library based on parsing expression grammars with built in AST generation abilities.
A code-authoring expert system
I'm not going to bother with WSL builds of this project. I'm retired. MSS Code Factory is a model-to-source code manufacturing tool that enables Fractal Programming by capturing a programmer's coding architecture and style through a General Expansion Language (GEL) XML syntax. It produces a Java 8 Object-Relational Management caching architecture with pluggable persistent storage to DB/2 LUW, MySQL, Oracle, PostgreSQL, and SAP/Sybase ASE databases, as well as an in-memory RAM repository. It also produces a structured SAX XML parser for loading databases, an X(ml)Msg implementation for client-server communications, and JavaFX components for custom GUIs with full support for field validation reporting to a CFConsole. There is a partial C++14 coding attempt as well, which has not been debugged. But it proves the point and the engine supports it. All source code now resides at https://github.com/msobkow The 2.9 and 2.10 projects are now all under an Apache V2 license.
QsT SQL Tools - ORM system based on Qt 4.6.0 (and higher) to improve programming databases with Qt. QST has a little functionality to make simple SELECT, INSERT, UPDATE, DELETE and EXEC queries. It uses PostgreSQL but can be ported for other language
High-speed C++ MVC Framework for Web Application
TreeFrog Framework is a high-speed C++ MVC framework for developing Web applications.
YB.ORM is a tool for object-relational mapping (ORM) for C++. Inspired by things like Hibernate or SQLAlchemy. Should be database-independent. Includes a tool for code generation of Domain objects. Tables' metadata description is an XML file.