We present three types of eHealth applications that can enhance quality of clinical decision-making. Formalized electronic medical guidelines are bringing medical knowledge close to clinicians. eHealth tools for evaluation knowledge and competency in a given clinical decision-making problem are demonstrated by systems ExaMe and TECOM. The TECOM system supports training of clinical competence in a given decision-making problems using real clinical cases. The TECOM system estimates the decision-maker abilities using a coefficient of prediction or a classical error rate. Transfer of data and knowledge important for clinical decision-making without language barriers is demonstrated on features of the European Journal for Biomedical Informatics.