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Consider ClassroomWindow, another Boston startup designed to offer teachers a dedicated channel to review the products and services they regularly use. The concept is not unlike the popular online site Yelp, where customers rate everything from restaurants to retailers, collectively sharing information about their experiences.

“One of the major failings in the educational marketplace is a lack of data from end users,” said company founder and CEO Kirby Salerno, noting that the $25 billion K-12 market is dominated by major suppliers such as the publishing houses McGraw-Hill and Pearson. “This puts teachers in an incredibly powerful position.”

Classroom Window, which is expected to launch in beta in early January, is free to teachers, who can choose to be anonymous when creating their reviews, eliminating worry over possibly offending administrators who hold the purse strings, Salerno said. Profit is expected to come primarily from selling their opinions, which could give suppliers valuable insight about what’s good and bad about their products.

Salerno is bootstrapping development with less than $1 million in funding from friends and family. “You’ve got this sort of massive marketplace that is irrational,” said Salerno, a prior cofounder of Seattle-based startup Teach First, an online video database designed to help newer teachers that was sold in 2008. “We’re intentionally creating a very, very low barrier to entry for teachers and schools to participate.”

Educators’ willingness to sign on may be helped by the proliferation of broad-reaching social media platforms such Facebook, Foursquare and Twitter, according to Kim Smith, cofounder and CEO of Bellwether Education Partners, a nonprofit group supporting educational innovation.

“People are getting more and more comfortable with social media and crowdsourcing in the rest of their life,” Smith said. “You are starting to see these crowdsourcing solutions. It’s just an entirely different market than we’ve seen before.”

Students at a variety of levels are likely to have an increasing role in controlling the products they do and don’t buy. At least that’s the hope of Chicago-based attorney and nascent entrepreneur Ryan Jacques. Jacques is developing a crowd-sourced platform called EditionMatch that will help law students and others avoid the cost of purchasing brand new textbooks each year.

His startup will enlist students’ help to create online indexes to bridge the gaps between older and newer versions of the texts.

“The impetus was personal experience,” said Jacques, who plans to launch the site early in 2012.

“Law school books are extremely expensive. Previous editions of these textbooks were exponentially cheaper.”