Four projects supported by the Innovation in Giving Fund have been awarded follow-on funding totalling £561,462.
Nick Hurd, the Minister for Civil Society, announced the extra funding from the £10m pot, which is supplied by the Cabinet Office, at an event on 7 November.
The Innovation in Giving Fund is managed by the innovation charity Nesta.
The Timewise Foundation, which runs Women Like Us, a service that offers careers support to women who want to fit work around their family responsibilities, has been given £147,462 for Careers Online, a new digital network that connects thousands of mothers with professional women who can help them with careers advice.
Young Philanthropy has been awarded £175,000 towards its syndicate model, which enables groups of young professionals to join together and invest their money, time and skills in charity projects, with matched funding and support from an experienced philanthropist. The grant will enable the team to recruit additional members of staff and fund developments of their website and payment platform.
Trading for Good has been awarded a grant of £120,000 towards its free service that supports small and medium-sized businesses to adopt better social and environmental practices.
Dot Dot Dot Property Guardians, which gives volunteers cheap homes by placing them in properties that would otherwise be empty, has been given a grant of £119,000 to pay for the staff and start-up costs of establishing the commercial wing of its operation.
All four projects were among those awarded initial grants from the fund of £50,000 in October 2012 in the second round of the fund.
Hurd said: "We are really proud of the fund. It has been our mission to play our part in rebooting and revitalising the culture of giving in this country.
"It is good to encourage fresh thinking and reach out to the social entrepreneurs who have got the ideas. But it is also about challenging established charities to think about the futures."