Financing Open Source projects has been one of the main difficulties for years. Currently, well-funded projects usually depend on a small number of big companies. Donations from physical persons (and users) are also a common revenue source. Hundreds (thousands?) of small companies are using Open Source in Europe. Regularly donating only a small amount can make a difference for many projects they depend on. Marta will share the experience of giving by a small company in France with the list of "DOs and DON'Ts."