Projectilo is described as 'Bringing you the best web/app/tech projects from your favourite indie makers'. There are six alternatives to Projectilo, not only websites but also apps for a variety of platforms, including Android, iPhone, Android Tablet and iPad. The best alternative is Product Hunt, which is free. Other great sites and apps similar to Projectilo are Hacker News (Free), Lobsters (Free, Open Source), SideProjects (Free) and Indie Hackers (Free).
Lobsters is a technology-focused link-aggregation site. The site is driven by Ruby on Rails with the source code being freely available for those seeking to create a site similar to Reddit or Hackernews.