Tally erp.9 software solution in delhi Tally Developer The language used to build Tally.ERP 9 is called TDL - Tally Definition Language, briefly touched upon in Internal Architecture & Design. As a Tally Service Partner, a Tally Integrator, an internal IT 'shop' at a customer location or a free lancer developing extensions to Tally.ERP 9, we make available Tally.Developer 9, an Integrated Development Environment (IDE) along with the full TDL source code .. cont-Ankush 9268108406