Lotus Development Corp., Cambridge, Mass., said President Jim Manzi has been named to the additional post of chief executive, succeeding Mitchell D. Kapor, who continues as chairman. Kapor, who founded the software maker, will work full time on new product design, new business opportunities and corporate strategy, the company said. Kapor said Manzi’s new title represents “a formalization of the way Jim and I have been working together.” Manzi joined Lotus in 1983.