This document discusses how to build a Twitter bot using ASP.NET with free tools. It recommends using Visual Studio Express 2012 for Web to develop ASP.NET applications for free. It also suggests using the F# functional programming language with Visual Studio due to its simpler syntax and free tools. The document recommends hosting ASP.NET web applications for free using platforms like AppHarbor and Windows Azure Websites, and using services like SetCronJob for free scheduled jobs over HTTP.