LINQPad - A scratchpad for C#, F# and VB code including Linq queries.
Toad Edge - Windows GUI for MySQL. SQL Syntax Check. Freeware (Basic Features) & Payware (Extended Features).
Linqer - Linqer is a SQL to LINQ converter tool.
Apache MetaModel - Non-Native Database Management Systems
Snippet Compiler - Authors description: "Snippet Compiler compiles snippets."
Apache Geode - Apache Geode is a distributed, in-memory database with strong data consistency, built to support transactional applications with low latency and high concurrency needs.