LINQPad - A scratchpad for C#, F# and VB code including Linq queries.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
LINQ Insight - Execute LINQ Queries directly from Visual Studio without building the application. Verify your LINQ queries in a single click and view data with LINQ Insight!
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Snippet Compiler - Authors description: "Snippet Compiler compiles snippets."
Better Uptime - We call you when your website goes down