Top 5 data-access-layer open source projects

Data mapping and persistence toolkit for Ruby

SQL query builder, written in c#, helps you build complex queries easily, supports SqlServer, MySql, PostgreSql, Oracle, Sqlite and Firebird

Non-native graph database abstraction layer for Node.js and web browsers.

📇 A simple and sane fake data generator for C#, F#, and VB.NET. Based on and ported from the famed faker.js.

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.