YC W14 non-profit OpenCurriculum announced the launch of a free, online library of educational materials for math teachers:

Aimed at providing teachers with educational materials by making them open and competitive, OpenCurriculum, which launched in Pittsburgh, curates and organizes material from sites such as teacher blogs and lesson material publishers. Teachers can create lesson plans and more through OpenCurriculum.org.

In its effort to provide high-quality learning and an openness in K-12 education, OpenCurriculum released a 5,000-document library on its website for math teachers to use as lesson materials. Anyone can use the material on the website without logging in, but to get access to tools such as the lesson plan builder, you need to create an account. The tools aren’t tailored for a particular subject matter.

OpenCurriculum’s tools are used by about 6,000 teachers and users every month. With the tools from the new library, about 20 teachers who were in beta with the library found that teachers are saving 50 percent of the first-time lesson planning and 20 percent of lesson plan revision time.