The best replacement for ossim is security onion.

The best alternatives to ossim are rated as following:
★★★★★  security onion
★★★★  alienvault
★★★★  ossec
★★★  arcsight

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

Other search terms related to ossim and their ratings are:
★★★★★ ossec
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ossim
security onion
alienvault