Top 4 microorm open source projects

An alternative to ORM's such as Entity Framework, offers light-weight database mapping to your existing CLR objects. Visit "Design Goals" on GitHub to see more rationale and guidance.

SQLHelper is a wrapper around DbConnection/DbCommand and a micro ORM. It automatically handles batching, data conversion, transactions, etc. for you. It's been around even longer than Dapper as part various libraries I've had over the years.

Simple Data Access Object library with LinQ and multiengine support for (Windows,Linux,OSX/IOS/Android) and freepascal (Windows/Linux)

High performance micro-ORM modern Dapper replacement for .NET Standard 2.1 and higher