The best replacement for ims is db2.

The best alternatives to ims are rated as following:
★★★★★  db2
★★★★  cics
★★★  time
★★★  idms
★★★  ncs
★★  guard dog
★★  uma
★★  clarke
★★  career launcher
★  ngn
★  ncs modem
★  sorrell
★  time which is better
★  mms
★  scorm
  predator missile
  dry needling
  liaison
  softswitch
  acupuncture
  volte
  ics
  sdp
  jamboree
  ayotte

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

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



Google Trends

Scale is based on the average worldwide traffic of ims in all years. Click on graph for more.
ims
db2
cics