With their recent version upgrades, both Elgg and SocialEngine are getting plugin upgrades.

Elgg, which has the best support for open standards (OpenID and OpenSocial, and their own OpenDD initiative) and is arguably the most flexible, has posted several plugins on their site. More are being posted in the Elgg Google Group.

A key plugin mentioned by Openedweb.com allows you to pre-set which widgets will show on the default users page. In the base install, users have to configure their own home page, which would be too confusing for most markets.

What may end up hurting Elgg’s adoption rate is that a lot of marketers are looking for an admin-driven app that requires minimal customization. Right now, Elgg is appealing directly to the developer community, so much so that they don’t even have a demo of the basic platform and its admin features.

Over at SocialEngine, meanwhile, the first of their V3 plugins (Photo Albums) is in public beta.