There are quizzes like Who Should You Vote For? online, where you tell them your attitudes to policies, and they tell you at the end which parties your views seem to coincide with the most.
Abortion Rights are doing an election campaign. You can download a factsheet, and lobby your candidates via the site. You just type in your postcode and it lets you email all your local candidates. It then requests that you let them know your candidates' responses to their questions on abortion rights, so that others who enter their postcode can see where everyone stands.
I have only had a response from one candidate (Green, and she answered the way I hoped she would), but hopefully the others will be forthcoming too.
Similarly, the UK Disabled People's Council have put together a list of questions which you may want to question your prospective MPs about.
MyGayVote.co.uk has pie charts showing how the different parties have fared in terms of their past votes on LGBT issues.
Planet Mouret Films is "a blog designed for learning disabled adults and those who are involved in the LD community", with lots of straight forward information about the general election, links to easy-read information about voting, easy-read manifestos and the rights of learning disabled adults to vote.
And Scope are urging "local authorities to act immediately to make sure polling stations are more accessible. They have warned that some people may find it difficult to vote in next month’s elections but said it was not too late for councils to make a difference."
(Cross-posted at The F Word)