This supplement provides detailed information on stable organic radical qubits and their applications in quantum information science. The article discusses characterization methods for T1, Tm, and Rabi oscillations, focusing on pulse electron paramagnetic resonance (EPR) spectroscopy. Pulse EPR spectroscopy is used to initialize, manipulate, and read out the state of electron spins. T1 can be measured using inversion recovery or saturation recovery pulse sequences, while Tm is typically characterized by a Hahn echo decay pulse sequence. Rabi oscillations demonstrate the manipulability of spin states. The article also explores the influence of the Larmor frequency on electron spin dynamics, showing that different spin relaxation processes are affected by the Larmor frequency. For example, direct and thermally activated processes show significant frequency dependence, while Raman, Orbach, and local-mode processes are frequency-independent. The article also presents data on the T1 and Tm values of various stable organic radical qubits, including triphenylmethyl, nitroxide, semiquinone, and radicals based on graphene nanoribbons and carbon nanotubes. The results show that the frequency dependence of T1 and Tm varies depending on the type of radical and the frequency range. The supplement also includes figures and tables that illustrate the spin dynamics and relaxation processes of these radicals. The study highlights the importance of understanding spin relaxation mechanisms and the influence of environmental factors on the performance of organic radical qubits in quantum information science.This supplement provides detailed information on stable organic radical qubits and their applications in quantum information science. The article discusses characterization methods for T1, Tm, and Rabi oscillations, focusing on pulse electron paramagnetic resonance (EPR) spectroscopy. Pulse EPR spectroscopy is used to initialize, manipulate, and read out the state of electron spins. T1 can be measured using inversion recovery or saturation recovery pulse sequences, while Tm is typically characterized by a Hahn echo decay pulse sequence. Rabi oscillations demonstrate the manipulability of spin states. The article also explores the influence of the Larmor frequency on electron spin dynamics, showing that different spin relaxation processes are affected by the Larmor frequency. For example, direct and thermally activated processes show significant frequency dependence, while Raman, Orbach, and local-mode processes are frequency-independent. The article also presents data on the T1 and Tm values of various stable organic radical qubits, including triphenylmethyl, nitroxide, semiquinone, and radicals based on graphene nanoribbons and carbon nanotubes. The results show that the frequency dependence of T1 and Tm varies depending on the type of radical and the frequency range. The supplement also includes figures and tables that illustrate the spin dynamics and relaxation processes of these radicals. The study highlights the importance of understanding spin relaxation mechanisms and the influence of environmental factors on the performance of organic radical qubits in quantum information science.