Remarkboxremarkbox.com
Open-source hosted comments with moderation, priced on a pay-what-you-can basis.
- Open source
1 moderator
A few domains
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4 services
4 services
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GraphCommentgraphcomment.com
Embeddable comment system for building discussion around website content.
Limits not listed
IntenseDebateintensedebate.com
Comment widget that plugs into WordPress, Tumblr, Blogger and other site platforms.
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Utterancesutteranc.es
Comment widget that stores each page's discussion as a GitHub issue.
- Open source
Limits not listed