kitty - A terminal emulator

Major features:

• Uses OpenGL+FreeType for rendering
• Supports tiling multiple terminal windows side by side in different layouts without needing to use an extra program like tmux
• Supports all modern terminal features: unicode, true-color, mouse protocol, focus tracking, bracketed paste and so on.
• Easily hackable (UI layer written in python, inner loops in C for speed). Less than ten thousand lines of code.
• Rendering of text is done in an actual character grid, so the common problems with most Terminals when using wide characters/complex scripts do not occur. The downside is that scripts with complex glyph layout, such as Arabic do not render well.

Resources on terminal behavior

http://invisible-island.net/xterm/ctlseqs/ctlseqs.html

https://en.wikipedia.org/wiki/C0_and_C1_control_codes

http://vt100.net/