The best replacement for pycharm is pydev.

The best alternatives to pycharm are rated as following:
★★★★★  pydev
★★★  sublime
★★★  intellij
★★★  aptana
★★★  spyder
★★  webstorm
★  pyscripter
★  komodo
★  komodo edit
★  komodo ide
★  wingide
  canopy
  wing
  idea
  ninja ide

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

Other search terms related to pycharm and their ratings are:
★★★★★ django
★★★★★ ipython
★★ virtualenv
★★ pyqt
You have in mind a companion for pycharm and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pycharm in all years. Click on graph for more.
pycharm
pydev
sublime