We are using open legacy for our ERP system to connect with our third party application like PayU. This is an amazing platform as it have all modules of SAP Business One available so we can integrate our entire business process from one place. Nothing particular I dislike about this tool but sometimes you face difficulties while connecting third parties systems if not familiar with their technical documents. Definitely try out open Legacy its best solution when compared to other tools that provide similar features with more price tags. It has helped us to reduce manual work by almost 100% for different business processes.