The passwords will allow the organisations to view, edit and update their entries before the information portal becomes available for public use next month.
In a separate development, CharityFacts.org, a website set up by Professor Adrian Sargeant to provide basic information about fundraising, looks set to be managed by the Institute of Fundraising.
Sargeant, who set up the site at the end of last year, confirmed that the idea of linking it with the institute had been mooted, but said no decision had yet been made. A spokesman at the institute said it was looking into the possibility of taking the site on.
Sargeant, professor of non-profit marketing at Bristol Business School, is currently working at the Centre of Philanthropy in Queensland, Australia, and hopes to have a meeting with the institute when he returns to the UK in September.
He said: "It was never my intention to look after the site in the medium to long term.
"It would be better for a sector body, rather than an academic, to take it on and move it forward."
CharityFacts is intended as a resource for the public, journalists and researchers, and receives about 600 hits a week.
Sargeant suggested that the website could also be brought within the ImpACT coalition.
He added: "As with most initiatives, we need to consolidate and give a sense of united purpose."