Google is currently accepting proposals for Summer of Code projects with Neo4j, a graph database. Two proposed projects are already on board: one with uDIG to make Neo4j a spatial database capable of complex algorithms like routing and N-dimensional indexing; the other with Gephi to enable visualization of graphs directly from Neo4j. These projects aim to make Neo4j compatible with OpenGIS and GeoTools standards, respectively, allowing it to be used as an alternative to PostGIS and other GIS backends. The opportunities for students to work on these projects are expected to be popular, so it's recommended to submit proposals early.