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Top 23 C# ORM Projects
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Entity Framework
EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.
Project mention: Mastering EF Core Interceptors: Hook into the Pipeline with the Decorator Pattern | dev.to | 2025-04-19EF Core GitHub Repository
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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SqlSugar
.Net aot ORM Fastest ORM DB2 Hana Simple Easy VB.NET Sqlite orm Oracle ORM Mysql Orm 虚谷数据库 postgresql ORm SqlServer oRm 达梦 ORM 人大金仓 ORM 神通ORM C# ORM , C# ORM .NET ORM NET5 ORM .NET6 ORM ClickHouse orm QuestDb ,TDengine ORM,OceanBase orm,GaussDB orm ,Tidb orm Object/Relational Mapping
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FreeSql
.NET aot orm, VB.NET/C# orm, Mysql/PostgreSQL/SqlServer/Oracle orm, Sqlite/Firebird/Clickhouse/DuckDB orm, 达梦/金仓/虚谷/翰高/高斯 orm, 神通 orm, 南大通用 orm, 国产 orm, TDengine orm, QuestDB orm, MsAccess orm. (by dotnetcore)
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EFCore.BulkExtensions
Entity Framework EF Core efcore Bulk Batch Extensions with BulkCopy in .Net for Insert Update Delete Read (CRUD), Truncate and SaveChanges operations on SQL Server, PostgreSQL, MySQL, SQLite, Oracle
This approach can be inefficient when dealing with a large number of records, leading to significant database overhead and longer execution times. To mitigate this, we can use techniques like batching, raw SQL queries, or third-party libraries like EFCore.BulkExtensions.
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In our products we use EF Core and we need to create migrations that are supported for all 3 databases. And we use Fluent Migrator library for this purpose. It allows creating database migration using the fluent syntax that is further translated to the needed SQL for each particular database.
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There is https://github.com/linq2db/linq2db which is LINQ to SQL reincarnated.
Of course there's EF Core too.
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Pomelo.EntityFrameworkCore.MySql
Entity Framework Core provider for MySQL and MariaDB built on top of MySqlConnector
ABP Framework's MySQL provider (Volo.Abp.EntityFrameworkCore.MySQL) relies on Pomelo.EntityFrameworkCore.MySql NuGet package. However, as of now, the stable 9.0.0 version of this package has not been released. (You can follow the upgrade status from https://github.com/PomeloFoundation/Pomelo.EntityFrameworkCore.MySql/issues/1841, if you want).
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Documentation: NHibernate Documentation
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Dapper Extensions
Dapper Extensions is a small library that complements Dapper by adding basic CRUD operations (Get, Insert, Update, Delete) for your POCOs. For more advanced querying scenarios, Dapper Extensions provides a predicate system. The goal of this library is to keep your POCOs pure by not requiring any attributes or base class inheritance.
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EntityFramework.Exceptions
Strongly typed exceptions for Entity Framework Core. Supports SQLServer, PostgreSQL, SQLite, Oracle and MySql.
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Entity Framework 6
This is the codebase for Entity Framework 6 (previously maintained at https://entityframework.codeplex.com). Entity Framework Core is maintained at https://github.com/dotnet/efcore.
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sharding-core
high performance lightweight solution for efcore sharding table and sharding database support read-write-separation .一款ef-core下高性能、轻量级针对分表分库读写分离的解决方案，具有零依赖、零学习成本、零业务代码入侵
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SmartSql
SmartSql = MyBatis in C# + .NET Core+ Cache(Memory | Redis) + R/W Splitting + PropertyChangedTrack +Dynamic Repository + InvokeSync + Diagnostics
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NPoco
Simple microORM that maps the results of a query onto a POCO object. Project based on Schotime's branch of PetaPoco
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ExcelMapper
An Excel to object mapper. Maps POCOs to and from Excel. Configuration via convention, attributes, or fluent methods.
Project mention: .NET: Integration Test for uploading csv/excel file via HttpClient | dev.to | 2025-02-07ExcelMapper for working with Excel file
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Npoi.Mapper
Use this tool to import or export data with Excel file. The tool is a convention based mapper between strong typed object and Excel data via NPOI.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C# ORM discussion
C# ORM related posts
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Mastering EF Core Interceptors: Hook into the Pipeline with the Decorator Pattern
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Implementing temporal table auditing in software development projects
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Entity Framework 9 - GroupBy throwing Exception
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React Image Editor: Load and Save Images from a Database Easily
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How To Create Migrations For Multiple Databases in EF Core
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Diverse AI tools used for the C# developer
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Bulk Update with Entity Framework Core (EF Core)
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A note from our sponsor - InfluxDB
www.influxdata.com | 16 May 2025
Index
What are some of the best open-source ORM projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Entity Framework | 14,114 |
| 2 | SqlSugar | 5,559 |
| 3 | FreeSql | 4,221 |
| 4 | EFCore.BulkExtensions | 3,818 |
| 5 | FluentMigrator | 3,367 |
| 6 | LINQ to DB | 3,086 |
| 7 | Pomelo.EntityFrameworkCore.MySql | 2,821 |
| 8 | NHibernate | 2,147 |
| 9 | PetaPoco | 2,098 |
| 10 | Dapper Extensions | 1,801 |
| 11 | RepoDb | 1,801 |
| 12 | Massive | 1,797 |
| 13 | LINQKit | 1,721 |
| 14 | Fluent NHibernate | 1,663 |
| 15 | EntityFramework.Exceptions | 1,620 |
| 16 | Entity Framework 6 | 1,443 |
| 17 | sharding-core | 1,209 |
| 18 | SmartSql | 1,117 |
| 19 | Insight.Database | 885 |
| 20 | NPoco | 860 |
| 21 | ExcelMapper | 845 |
| 22 | MicroOrm.Dapper.Repositories | 683 |
| 23 | Npoi.Mapper | 621 |
Sponsored
InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com