The best replacement for continuous integration is gated check-in.

The best alternatives to continuous integration are rated as following:
★★★★★  gated check-in
★★★★  continuous build
★★★  continuous deployment
★★★  feature branches
★★  build automation

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Speaking about continuous integration, one probably shouldn't forget about tfs 2010.

Other search terms related to continuous integration and their ratings are:
★★★★★ tfs 2010
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continuous integration
gated check-in
continuous build