Kravenwolf is right, for animations you would have to make them yourself.
If you want it for free that is.
If not, i suppose there are still some talented animators for hire.
And as for retextures you can use GIMP. Maybe follow some tuts before beginning though.
Also! Creator of Zombies released some great shaders for free.
You should really try them! Great quality and improves the graphics alot!
Also if you use custom media. Or media without a normal map.
Than you still would have to download GIMP (i guess GIMP has a normal map filter or something?)
Or maybe there are some normal map converters or something for free out there?
And the others are also right. Its allways good to change some settings just to fiddle with the lightmap text size etc.
Sometimes it really comes out very nice.