Basic courses on logic are common in most computer science curricula. Students often have difficulties in handling formalisms and getting familiar with them. Educational software helps to motivate and improve the teaching-learning processes. Therefore, incorporating these kinds of tools becomes important, because they contribute to gaining practice in dealing with formalisms. In particular, semantic analysis of first order logic formulas is an issue that presents several difficulties. For this reason, we developed two educational tools, "FOLST" and "LogicChess," to support the teaching/learning process in first order logic semantics. Both tools are didactic, visual, and interactive. They allow users to experiment with first order logic formulas to determine their truth value. They are implemented in C++, and they have been released under a free software license. In this paper, we present "FOLST" and "LogicChess," and we propose to design a framework based on the development and use of these two didactic tools.