There are so many schemes out there now, all competing for a market that really shouldn't be necessary, that it's become rather overwhelming!  For many of those indexed below, clicking the image takes you to a page that gives a synopsis of what's available and, where I have been able to find it, an indication of cost.  Others go straight to the site in question.  Most offer a free trial of some sort, which is highly recommended.  See also the section on Free Schemes and Units of Work where there are links to numerous benevolent providers which have produced some rather good resources for complete units of work.

All schemes have their limitations and one size does not fit all; take free trials and go with what works for your setting - your children, your skills progression and your available resources.  When using a scheme: (1) always prepare by at least looking through the lesson before you deliver it; and (2) remember that continuous formative assessment is key - if they're not ready to move on, give them more time to practise because "progress" is about improving, not about simply adding more just because it's there.