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gucharmap

Unicode character picker and font browser

This program allows you to browse through all the available Unicode characters and categories for the installed fonts, and to examine their detailed properties. It is an easy way to find the character you might only know by its Unicode name or code point.
measure objects on screen with a variety of metrics

screenruler

measure objects on screen with a variety of metrics

ScreenRuler will display a ruler on screen which allows you to measure the other objects that you've there. It has the following features: * Horizontal and vertical measurement in 6 different metrics: pixels, centimetres, inches, picas, points, and as a percentage of the ruler's length. * Cusomizable colors and fonts. * Keyboard control for precise positioning. * Option for the ruler to stay always on top of other windows.
font editor

fontforge

font editor

FontForge is a font editor. Use it to create, edit and convert fonts in OpenType, TrueType, UFO, CID-keyed, Multiple Master, and many other formats.
metapackage to pull in Roboto fonts

fonts-roboto

metapackage to pull in Roboto fonts

Roboto is Google's signature family of fonts, the default font in Android and ChromeOS and the recommended font for Google's visual language, Material Design.
font viewer for GNOME

gnome-font-viewer

font viewer for GNOME

This program can preview fonts and create thumbnails for fonts.
simple viewer for NFO files

nfoview

simple viewer for NFO files

NFO Viewer is a simple viewer for NFO files, which are "ASCII art" in the CP437 codepage. The advantages of using NFO Viewer instead of a text editor are preset font and encoding settings, automatic window size and clickable hyperlinks.