Linux Equivalents to Windows Software The Linux Equivalents to Windows Software series now contains 227 entries, listing the finest Linux software available. Read about our latest addition: KPlayer - a KDE multimedia player. In case you missed our announcement, also check out our 80 of the Best Linux Security Applications. (Read more) gtkmm gtkmm is the official C++ interface for the popular GUI library GTK+. Highlights include typesafe callbacks, and a comprehensive set of widgets that are easily extensible via inheritance. You can create user interfaces either in code or with the Glade User Interface designer, using libglademm.