Résumé
A brief overview of non-standard big bang nucleosynthesis (BBN) scenarios is
presented. Trends and results of the light-element nucleosynthesis in BBN
scenarios with small-scale or large-scale inhomogeneity, the presence of
antimatter domains, stable or unstable massive neutrinos, neutrino
oscillations, neutrino degeneracy, or massive decaying particles are
summarized.