The best replacement for 3.3 is 3.8.

The best alternatives to 3.3 are rated as following:
★★★★★  3.8
★★★  savage 4.6
★★★  2.7
★★★  3.8 chrysler
★★★  savage x 4.6
★★★  savage xl
★★  e revo brushless
★★  lightroom 4
★★  rustler vxl
★★  os .18
★★  2.5
★  picco .26
★  2.5r
★  tmaxx 3.3
★  revo 3.3
★  nitro rustler
★  savage x
★  os 18
★  mgt 8.0
★  losi xxl
★  .21
★  e-revo
★  lst2
★  4.6
★  e revo
★  rp23
  3.2
  slayer pro
  t-maxx 3.3
  erevo
  3.8 caravan
  os 18tm

Your alternative for 3.3 is not listed? Suggest!
Speaking about 3.3, one probably shouldn't forget about pygame.

Other search terms related to 3.3 and their ratings are:
★★★★★ pygame
You have in mind a companion for 3.3 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 3.3 in all years. Click on graph for more.
3.3
3.8
savage 4.6