Past studies have found that there are constraints on teachers in developing teaching and learning (TnL) resources to implement STEM education in the classroom. Based on this issue, this research has developed a platform containing a variety of STEM TnL resource materials that focus on the field of Discrete Mathematics learning. This field of study is an area of learning in KSSM Mathematics for form four students. It encompasses three titles, namely Logical Reasoning, Operations on Sets, and Network in Graph Theory. Discrete Mathematics was the focus in the development of this platform as it is often considered difficult for students to understand. Additionally, as teachers find it challenging to find suitable learning materials to get students to be more interested. The wide range of TnL STEM source materials contained in this platform makes it easier for teachers to choose and apply them in TnL. The ADDIE model was used as the development model for this platform. This model is among the most systematic and effective development models, consisting of five phases, i.e. analysis, design, and development, implementation, and evaluation. The platform was developed using an interactive multimedia medium that makes learning fun for students.