Is re-publishing religious articles containing Qur'anic verses and supplications after the death of their author considered an ongoing charity (Sadaqah Jariyah) for him?

The beneficial knowledge whose reward accrues to the deceased after death is that which encourages virtue and forbids vice. Whoever spreads it will have its reward as long as people benefit from it, and they are hoped to receive recompense when it is re-shared. It is a sign of loyalty to the deceased to spread their good deeds and words.