A list of other sites that also provide guidance for tools for startups:

• http://tuneyourstartup.com/tools.php  broad list of tools
• http://www.tapdom.com/resources/startup-tools/ focused primarily on gaming and mobile
• http://steveblank.com/tools-and-blogs-for-entrepreneurs/ Steve Blank's lists, with detailed comments and suggestions
• LowEndBox A list of hosting websites for bare minimum VPS or dedicated servers
• http://leanstartup.pbworks.com/BusinessModelCanvas lists business model canvas tools and related materials
• http://b2brev.com/business-tools/ lists tools from an analysis of website references
• http://list.ly/list/9E-tools-and-services-for-a-lean-startup Tools and Services for a Lean Startup
• http://startupweekend.org/resources/ Startup Weekend list of resources
• http://looksgoodworkswell.blogspot.com/2012/11/list-of-mockupprototyping-tools.html  Bill Scott's list of mockup and prototyping tools
• http://pi4mgt.wordpress.com/2012/12/26/liens-entrepreneurs-merci-philippe-cornette/ 
• http://selcukergin.blogspot.com.tr/ tools and links for startups by @selcuke
• http://www.emailvendorselection.com/ a list of more than 60 providers by Jordie van Rijn

To Be Curated

• http://news.ycombinator.com/item?id=5235137 thread contains a number of suggestions
• http://platformsandnetworks.blogspot.com/2010/01/free-software-for-managing-lean-startup.html a somewhat random list, comments contain many valuable sugggestions 

Market Share / Usage Numbers

• https://www.datanyze.com/market-share/ 

Security tools

• http://sectools.org/ security tools