Direct answer: The eight Democratic senators who broke ranks to help end the shutdown are Angus King, Catherine Cortez Masto, John Fetterman, Maggie Hassan, Jeanne Shaheen, Tim Kaine, Dick Durbin, and one additional Democrat who joined them in the bipartisan move. If you’d like, I can pull up the most current, citable lists from major outlets and provide exact vote details and quotes. Notes on context and how this unfolded:

• This group crossed party lines to advance a funding measure intended to reopen the government, in contrast with party leadership’s stance that emphasized preserving health-care subsidies and ACA-related provisions in the negotiation.
• The move prompted substantial backlash from many Democrats and progressive groups, with concerns that it undercut unified party negotiating strength. Some retiring or non-reelectable senators among the group meant different strategic incentives than in prior cycles.

If you want, I can fetch up-to-date, specific verifiable lists with each senator’s statement and the exact bill text they supported.