This SDK is a client library to integrate the ContextualWeb Web Search API into your Python applications. The Web Search API provides a way to search webpages globally with access to content that is relevant to a user’s search query. This API is a RESTful service that provides results to search queries for web pages, images and news articles with results in JSON. ContextualWeb is a global search engine that crawls web pages from a variety of sources that over the world wide web.
ResultR deserves mention as it's a meta search engine mashup built by two self-described "Web 2.0 Kids" as a high-school project. With it you can create your own search engine by choosing from 30+ sources you might want to include in your results.
CrowdRiff has announced API access to its Visual Influence platform. API access to CrowdRiff features allow users to deliver user-generated photos and associated features to marketing products and campaigns. Features include social media search, calls to action, photo acquisition, and more.