The best replacement for nmm is mo.

The best alternatives to nmm are rated as following:
★★★★★  mo
★★★  steam workshop
★★★  mod organizer
★★★  wrye bash
★★★  fomm new vegas
★★  obmm
★  arw
★  fomm

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

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



Google Trends

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nmm
mo
steam workshop