What modern C++ libraries should be in my toolbox? [closed]

I've been out of the C++ game for about 10 years and I want to get back in and start on a commercial app. What libraries are in use these days?

• User interface (e.g, wxWidgets, Qt)
• Database
• General purpose (e.g. Boost, Loki, STL)
• Threading
• Testing
• Network/sockets

I looking to be cross-platform compatible (as much as possible out-of-the-box).

What libraries to do you rely on? What features do they provide that make them "indispensable"?

See my answer below for a summary.

Cross-platform libraries that are free for commercial (or non-commercial) applications

Feel free to expand this list

• General Purpose
  • Boost
  • Loki
  • MiLi
  • POCO
  • STL (of course)
  • STXXL (STL re-implementation for extra large data sets)
  • Qt
  • ASL
  • JUCE

• Audio
  • FMOD
  • Synthesis ToolKit
• Database
  • SOCI
  • OTL
  • LMDB++
• Design
  • IoC Frameworks
    • Hypodermic
    • PocoCapsule
    • Wallaroo
• Documents
  • LibreOffice API
  • PoDoFo
• Graphics
  • Allegro
  • OGRE
  • SFML
• GUI
  • FLTK
  • GTK
  • Qt
  • Qwt
  • wxWidgets
  • VTK
• Hashing
  • MurmurHash3
• Imaging
  • Boost.GIL
  • CImg
  • DevIL
  • EasyBMP
  • FreeImage
  • ITK
  • OpenCV
• Logging
  • Boost.Log
  • log4cxx
  • Pantheios
• Mocking
  • Google Mock
  • Hippo Mocks
  • Turtle (C++ mock object library for Boost)
• Multimedia
  • openframework
  • Cinder
  • SDL
• Networking
  • ACE
  • Boost.Asio
  • ICE
• Testing
  • Boost.Test
  • Google Test
  • UnitTest++
  • doctest
• Threading
  • Boost.Thread
• Version Control
  • libgit2
• Web Application Framework
  • CppCMS
  • Wt
• XML
  • Libxml2
  • pugixml
  • RapidXml
  • TinyXML
  • Xerces-C++

Links to additional lists of open source C++ libraries:

http://en.cppreference.com/w/cpp/links/libs

Sorry for repeating some of the stuff already written, but:

• UI: Qt
• Database: SOCI
• General purpose: Boost, Loki, STLSoft Libraries, ASL
• Threading: Boost.Thread
• Testing: Boost.Test
• Build tools: Boost.Build, SCons

(Should at least get you started)

On Windows...

ATL for COM development WTL for user interface

CGAL is an excellent c++ library for computational geometry

www.cgal.org

http://loki-lib.sourceforge.net/ might also be good addition.

It's another template library, which introduces typelists, and implementations for various design patterns.

I never used it, but I read Alexandrescu's book to get a better understanding of templates.