List of object-relational mapping software

This is a list of well-known object-relational mapping software. This list is neither up-to-date nor all-inclusive.

[edit] C++

Carbonado, open source framework, backed by Berkeley DB or JDBC
Cayenne, Apache, open source for java
CocoBase [1] by THOUGHT Inc., commercial implementation of JPA API for Java and .NET.
Ebean, open source ORM Framework
EclipseLink, Eclipse Persistence Platform
Enterprise Objects Framework, Mac OS X/Java, part of Apple WebObjects
Hibernate, open source ORM Framework, widely used
iBATIS, maintained by ASF, and with .NET port.
Java Data Objects (JDO)
JPOX, open source JDO 2 reference implementation
Kodo, commercial implementation of both the JDO and JPA API.
OpenJPA, Apache, open source, supports JPA API.
TopLink by Oracle
Apache Torque is an object-relational mapper for Java.
Apache OJB [2] is an object-relational mapper for Java.

.netTiers, open source, based on commercial code generation tool (Codesmith)
ADO.NET Entity Framework, Microsoft's ORM (released with .NET 3.5 SP1)
Atlas,open source
Base One Foundation Component Library, free or commercial
BCSEi ORM Code Generator, free or commercial
Business Logic Toolkit for .NET, open source
Castle ActiveRecord, ActiveRecord for .NET, open source
DataObjects.Net, open source, commercial
CocoBase [3], commercial implementation of JPA for .NET and Java
Devart LINQ to SQL [4], commercial, a LINQ engine for Oracle, MySQL, PostgreSQL, and SQLite
DevForce, commercial, N-Tier
Developer Express, eXpress Persistent Objects (XPO)
EntitySpaces, commercial
Euss, open source
Habanero, Free open source Enterprise application framework with a Free Code Generation Tool
iBATIS, Free open source
Invist,free ORM and code generation tool
LINQ, commercial, .Net framework component
LLBLGen, open source drivers, commercial
LightSpeed, free or commercial
Neo, open source
NConstruct, commercial
NHibernate, open source
Opf3 [5], free and commercial
ObjectMapper .NET, GPL and commercial license
Picasso, Free ORM and code generation tool
OpenAccess, free or commercial
TierDeveloper, free ORM and code generation tool
Persistor.NET, free or commercial
Quick Objects, free or commercial
Sooda, open source; BSD license
Subsonic, open source
Wilson ORMapper, commercial, open source
EntityORM, free and there are drivers for Sql Server, Sql CE, MySql, Oracle, PostgreSQL and Access

(scalars, arrays, objects). Based on database introspection. No class extending or code generation

Rocks, Open Source ORM for PHP 5.1 plus, free for non-commercial use (GPL)
Doctrine, Open Source ORM for PHP 5.2.3, free software (GNU LGPL)
Propel, ORM and Query-Toolkit for PHP 5, inspired by Apache Torque, free software (GNU LGPL)
dORM, ORM for PHP 5, free software (GNU AGPL). All major data types and relationships supported^[1]
EZPDO, Open Source ORM for PHP 5.0.4 or newer, free software (BSD)^[2]
DABL, Database class creator and Query builder, inspired by Propel but easier to install, free software^[3]
Data Shuffler, data mapper implementation (New BSD)^[4]
OutletOpen source ORM (beta) for PHP 5.1.6 or newer, uses an approach similar to Hibernate (New BSD)^[5]
Coughphp, Open source ORM for PHP5, uses code generation (It should be possible to hook up other database drivers, but out of the box only MySQL support is included.^[6]) (FreeBSD)
Redbean, ORM layer that creates and maintains tables on the fly. BSD License, PHP5^[7]
LightOrm, a small, fast and powerful ORM library for PHP 5^[8]
PersistentObject, an great-quality independant library from the eZ Components. New BSD License, PHP5^[9]

All ORMs below are open-source:

DBIx::Class - most popular^{[citation needed]}, often used with Catalyst
Rose::DB::Object
Fey::ORM - aimed more at SQL users than at avoiding SQL
Jifty::DBI - an ORM from the Jifty project
DBIx::DataModel - Classes and UML-style Associations on top of DBI
Data::ObjectDriver - built-in support for object caching and database partitioning
Class::DBI - the precursor of DBIx::Class; no longer maintained