The Backend Catalog for Relational Debris Information (BACARDI) is the DLR's approach to a space debris database. The custom middleware components are implemented in Python using ZeroMQ and Protocol Buffer technology.
CCSDS pursues standardization efforts in the field of spacecraft mission operations, called the CCSDS Mission Operations (MO) Framework. You can find DLR's open source contributions relating to the MO framework here.
4D Science Data Renderer in Virtual Reality Environments for Planetary and Atmosperic Research; Supports multiple Renderer Instances running at different locations in order to support Collaborative Work; Interactive Exploration Tools available.
DSC-HPC is a library that solves large sparse linear systems of equations in parallel (using MPI). It is based on an iterative Krylov-subspace method (FGMRES) preconditioned with a distributed schur complement approach (proposed by Saad 1999).