iodfengine is a defrag-oriented engine, a fork of ioquake3 with some dfengine features and some new things.
source: https://github.com/runaos/iodfe
ioq3 - https://ioquake3.org/
dfengine - https://cggdev.org/, https://q3defrag.org/files/dfengine/ (source mirror: https://github.com/cliffrowley/dfengine)
Features from dfengine:
in_mouse 3 - raw input for Windows, an alternative to sometimes buggy SDL input (in_mouse 1)
con_filter[0-9]
/download
/cl_mapAutoDownload
Drakkar's fast loading code
See README-DFEngine for detailed info
Other features:
iodfe_hud_snap_draw 1	- snapping hud, shows zones of possible acceleration (for 8 ms frametime)
	_snap_auto	- auto-shifting angle of the hud for different strafe styles
	_snap_def	- offset with no keys pressed or with scr_hud_snap_auto 0
	_snap_speed	- calculate zones for the stated speed instead
colors and position settings:
	_snap_rgba1
	_snap_rgba2
	_snap_y
	_snap_h
iodfe_hud_pitch	- angle marks, setting it to "-15 70" for example will put two marks at -15 and 70 degrees of pitch 
colors and position settings:
	_pitch_rgba
	_pitch_thickness
	_pitch_width
	_pitch_x
con_timestamp [0-1]	- adds a timestamp at each message in console
con_timedisplay [0-3]	- displays time at input line (1), at right bottom console corner (2) or at both places (3)
con_drawversion		- toggles version at right bottom console corner
con_filter			- toggles filtering with con_filter[0-9] vars
con_completemapnames	- toggles /map and /devmap autocompletion
con_notifylines		- number of lines shown in chat notify display
con_notifykeep		- keeps it not erased after opening console
con_notifyx		- x pos
con_notifyy		- y pos
ctrl+enter in console sends message with /team_say
ctrl+shift+enter sends it with /tell to df_mp_trackplayernum
in_keyboardRepeatDelay [ms]
in_keyboardRepeatInterval [ms]
in_numpadbug [0-1] - fixes non-working numpad on Windows
r_xpos, r_ypos		- game window position