1. The Prussian blue like ferromagnets are the most promising system to be applied to practice.

2. The main progress in the studies of organic ferromagnets is introduced.

3. Many species use built-in ferromagnets to detect their orientation with respect to the Earth's magnetic field.

4. A magnon-phonon interaction model is applied to two-)dimensional insulating ferromagnets.

5. For the interchain coupling model of the quasi-one-dimensional organic ferromagnets, we use the two-step DMRG method to calculate the total energy, the spin configuration and the dimerization.

6. This is the first experimental observation of the modification of the magnetism in thin-film ferromagnets by an electric field.

7. In the paper, we focus on the mechanism and the properties of the organic ferromagnets, and a view of special applications is also displayed.