The best replacement for sdm is chdk.

The best alternatives to sdm are rated as following:
★★★★★  chdk
★★★★  ccp
★★★★  cli
★★★  sdm
★★  rdm
★★  sdm express
★★  hsm
★  poa
★  rdm mast
★  jspm
★  cisco configuration professional
★  jsd

Your alternative for sdm is not listed? Suggest!
Speaking about sdm, one probably shouldn't forget about gns3.

Other search terms related to sdm and their ratings are:
★★★★★ gns3
★★★★★ packet tracer
You have in mind a companion for sdm and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sdm in all years. Click on graph for more.
sdm
chdk
ccp