#6098
Ultimaker Cura is a very popular, powerful and easy to use 3D printing & slicing application, created by David Braam from United States, but later developed and maintained by a 3D printer manufacturing company from Netherlands - Ultimaker and its community. The most important part is its very powerful open-source slicing engine. It can be used by anyone, whether an experienced or novice 3D printer user.

#5103
Slic3r is a lightweight, free and open-source 3D printing & slicing software developed by Alessandro Ranellucci from Italy (written in C++). Its comes with powerful functions, yet is convenient and simple to use. As one of the most professional and one of the few 3D printing programs, Slic3r's slicing speed is 100 times faster than the early Skeinforge, so it can definitely meet your high-tech 3D slicing needs.

#4844
Simplify3D is a powerful and easy-to-use 3D printing & slicing software that is able to control over all aspects of the 3D printing, also regarded as one of the best three 3D slicing software available at present (the other two are free Cura and open-source Slic3r). It supports the import of different types of files, as well as the export of G-code and X3G slice files, and supports most desktop and DIY 3D printers in the market!