The best replacement for pega is salesforce.

The best alternatives to pega are rated as following:
★★★★★  salesforce
★★★★  appian
★★★  jbpm
★★★  drools
★★★  oracle bpm
★★  savvion
★★  activiti
★★  filenet
★★  cordys
★★  ilog
★  lombardi
★  tibco
★  pegasso
  siebel
  ibm lombardi

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

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



Google Trends

Scale is based on the average worldwide traffic of pega in all years. Click on graph for more.
pega
salesforce
appian