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This week Theresa May has reached across one parliamentary divide to ask the Labour Party to work with her to pass a Brexit deal.

This necessity has been reached because the PM is unable to reach across the no-deal divide within her own party.

Is there any equivalent to the ERG and its pro no-deal stance within the Labour Party?

There's no ERG equivalent on Labor's end. But there are a few Labour MPs who are staunch Leavers, either on a personal basis, or because they represent constituencies that voted heavily for Leave during the referendum, or because they're concerned about the damage that not leaving might do to the UK and its institutions.

As a result, a handful Labor MPs rebel at each Brexit vote. But note that the exact number of Labor rebels, and the reasons they rebel, varies from one vote to another.

For instance, 9 Labour MPs voted against Yvette Cooper's amendment on April 3rd. On March 25th's vote on having indicative votes 8 Labor MPs voted against the Letwin amendment.

The votes around March 13th are some of the most interesting for your question, I think. Only 2 Labor MPs rebelled against the amendment that insisted that the UK should not leave the EU without an agreement, at any time. They were [Reject No Deal; Reject No Deal under any circumstances; Request a delay to Brexit]:

• Stephen Hepburn, of Jarrow (Leave 62%) [Aye; Aye; No]


• Kate Hoey, of Vauxhall (Remain 78%) [Aye; Aye; No]

During the same week, here's how the others who rejected Yvette Cooper's amendment voted:

• Sir Kevin Barron, of Rother Valley (Leave 67%) [Abs; Abs; Yes]


• Ronnie Campbell, of Blyth Valley (Leave 60%) [Aye; No; Abs]


• Rosie Cooper, of West Lancashire (Leave 55%) [No; No; Yes]


• Caroline Flint, of Don Valley (Leave 69%) [No; No; Yes]


• John Mann, of Bassetlaw (Leave 68%) [Aye; Abs; Yes]


• Dennis Skinner, of Bolsover (Leave 70%) [Aye; No; No]


• Graham Stringer, of Blackley and Broughton (Leave 51%) [Aye; Abs; No]

I suspect these are more interesting that the No Deal motion that MPs voted on as part of a series of indicative votes (see JJJ's answer), because when the latter were occurring there were much more interesting options on the ballot (the MPs were using approval voting rather than their usual Ayes/Noes).

Do any Labour MPs support no-deal?

Yes, three labour MPs voted for Mr Baron's motion B (No deal) in the indicative votes on the 27th of March 2019. From the voting records of the House of Commons, those MPs were:

Mr Ronnie Campbell MP (Blyth Valley
)

Kate Hoey MP (Vauxhall)

Mr Dennis Skinner MP (Bolsover)