image viewer by KDE

gwenview

image viewer by KDE

Gwenview is a fast and easy to use image viewer by KDE, ideal for browsing and displaying a collection of images.
Very fast and versatile 3D modeller/renderer

blender

Very fast and versatile 3D modeller/renderer

Blender is an integrated 3d suite for modelling, animation, rendering, post-production, interactive creation and playback (games). Blender has its own particular user interface, which is implemented entirely in OpenGL and designed with speed in mind. Python bindings are available for scripting; import/export features for popular file formats like 3D Studio and Wavefront Obj are implemented as scripts by the community. Stills, animations, models for games or other third party engines and interactive content in the form of a standalone binary are common products of Blender use.
Hugin control points tab

hugin

panorama photo stitcher - GUI tools

Hugin is a panorama photo stitching program. Essentially, Hugin is a GUI frontend for Panorama Tools. Stitching is accomplished by using several overlapping photos taken from the same location, and using control points to align and transform the photos so that they can be blended together to form a larger image. Hugin allows for the easy creation of control points between two images, optimization of the image transforms, and much more.
EDA software to develop printed circuit boards

librepcb

EDA software to develop printed circuit boards

Provides project management, powerful library management, and intuitive schematic and board editors. Human-readable, VCS-friendly file formats for libraries and projects. Supports multiple PCB variants for the same schematic and automatic netlist synchronisation between schematic and board.
Collection manager for books, videos, music, etc

tellico

Collection manager for books, videos, music, etc

Tellico is a collection manager for KDE. It includes default collections for books, bibliographies, comic books, videos, music, coins, stamps, trading cards, and wines.
i3wm = irssi +urxvt taken with scrot

i3-wm

improved dynamic tiling window manager

Key features of i3 are good documentation, reasonable defaults (changeable in a simple configuration file) and good multi-monitor support. The user interface is designed for power users and emphasizes keyboard usage. i3 uses XCB for asynchronous communication with X11 and aims to be fast and light-weight.