https://dstu.itch.io/ponyrace

Drop in your mods folder and add it to the end of the load order.

If people help me find bugs and suggest fixes, this could be a really great mod for the community to make use of.

Finally, don't be surprised if this mod breaks your game.  Always backup your save files, and install this mod on a fresh copy of strive 5.20a.

Next version goals:

Multiple new races at once

Auto detection of multiple files with race definitions and load them into the game.

Template version for easier customization of new races.

Tested with:

Win 7 64 bit

Windowed mode

Strive 5.20a

https://megaupload.nz/rbo5f3m3b4/strive_5.20a_zip

Random Portraits 1.0 + Delayed portrait loading 1.0

Not tested with:

Any other OS

Constants mod

v1.5 update:
Added options (ponysettings.gd). Edit with notepad to toggle optional content

Easymode: makes starting resources higher
Longpreg: increases pregnancy time and decreases growup time.
debug: makes the console very chatty
feralpreg: enable feral male on beastkin female impregnation

To do:
Clean up dead code
bug test more
fix corrupted saves bug (rare)
make adding more races or otherwise changing this mod easier for other users

v1.6 update: Fixed options (ponysettings.gd).  Options was broken in the last release. Alas, I eventually fixed the bug.

Had to make some ugly code to ensure functionality. If anyone has any ideas of how to implement my ideas with better code, I'm all ears.

To do:
Clean up dead code
bug test more
make adding more races or otherwise changing this mod easier for other users

https://www.strawpoll.me/16753537
https://www.strawpoll.me/16753537
https://www.strawpoll.me/16753537

v1.8 update: 

Added two more races:
Beastkin Pegasus:
- wings
- high agility, avg other

Beastkin Unicorn:
- custom unicorn horn
- high magic, lower other

Added more feral stuff:

- Increased warnings for feral impreg danger during sex scenes.

- Children of feral parents get uncivilized, pliable, and or ascetic traits semi-randomly.

- Family tree will now list feral parents as feral (previously looked like normal person). The race of the feral parent will always be beastkin (previously random race).

Added two more options:

- pubes: replaces shaven vaginas with naturally hairy vaginas. No variance; girls either have no hair (vanilla) or unshaven/natural hair (mod).

- furrymode: more furries (+40%) and less humans (-40%).

To do:
Clean up dead code bug test more
Make adding more races or otherwise changing this mod easier for other users

Current version (21b) doesn't work with ponymod. I'm out of town atm, but I'll update eventually. I'll also re-upload the version of strive ponymod does work with (20a) at some point as well.

Edit: uploaded strive 5.20a to Mega