DevSum is an annual conference for .NET developers held in Stockholm. It's organised by Cornerstone, a Swedish technical training company.

The conference usually has 300-350 attendees. While the conference often have many international speakers, all attendees, at least so far, is from Sweden and Swedish speakers typically present in Swedish.

While DevSum is much smaller in terms of number of attendees and parallel tracks (three) than other conferences in Scandinavia, such as NDC and Öredev, it's often appreciated for its intimate atmosphere. 

I've presented at DevSum three times:

• In 2011 about "Progressive EPiServer Development"
• In 2012 about ElasticSearch for .NET developers
• In 2013 about lessons learned from starting a small tech company