The Left Unity (new party) launched their manifesto the other day. It was announced by Ken Loach.

http://leftunity.org/download-or-order-the-manifesto/

I'm not aware of any other manifestos at this time.

The Trade Unionist and Socialist Coalition (TUSC) has launched their manifesto today.

http://tusc2015.com/tuscs-gene...l-election-policies/

The Labour Party manifesto issued this morning:

http://www.labour.org.uk/page/...rtyManifesto2015.pdf

Green Party's manifesto issued this morning:

https://www.greenparty.org.uk/manifesto

The Conservative Party's manifesto issued this morning:

https://www.conservatives.com/manifesto.aspx

The Liberal Democrats' manifesto:

http://www.libdems.org.uk/manifesto

UKIP's manifesto (from the Guardian's website):

http://www.theguardian.com/pol...to-2015-the-full-pdf

The Social Democratic and Labour Party (SDPL)'s manifesto:

http://www.sdlp.ie/site/assets...inster_manifesto.pdf

The Alliance Perty (Nothern Ireland equivalent of the Liberals)  - their manifesto:

http://allianceparty.org/docum...inster-manifesto.pdf

The Scottish Conservatory Party launched its manifesto today. Can't find it on their website and don't know how different to the Conservative's manifesto linked above on the 14th.

The Green Party in Northen Ireland's manifesto:

http://www.greenpartyni.org/ww...y_Manifesto_2015.pdf

Ulster Unionist Party's manifesto:

http://uup.org/assets/images/u...%20twentyfifteen.pdf

Sinn Fein's manifesto published today:

http://issuu.com/sinnfeinirela...r_manifesto_2015_web

SNP's manifesto launched today:

http://votesnp.com/docs/manifesto.pdf

DUP's manifesto published today:

http://www.mydup.com/publicati...estminster-manifesto

Arthur Scargill launched the Socialist Labour Party's manifesto yesterday:

http://www.socialist-labour-pa...sto%202015%20pdf.pdf