Native Instruments KONTAKT is said to be the audio industry standard sampler containing very advanced features like the unique Authentic Expression Technology, Background Loading and other fresh takes on sampling.
With KONTAKT 4 you can even edit, loop, slice and time-stretch your sounds and pitch shift samples in real time or tempo-sync them with a powerful Wave Editor. It also contains step sequencers and advanced envelopes to tweak your samples, 19 versatile studio-quality effects such as the convolution effect for reverbs or use the surround sound features for cinematic productions.
Here at Kreativ Sounds we have also created libraries for KONTAKT: RAW Textures
Sounds Library of Kontakt 4
Authentic Expression Technology in Kontakt 4
You can find KONTAKt 4 in Native Instruments KOMPLETE 7 Software