FX-602P Programmable Calculator is a programmable scientific calculator based on the FX-602P. See the FX-602P website
or blog
for details

PAYE TAX Calculator is an application for calculating UK Tax on your earnings (Pay As You Earn). It produces details calculation including Total Allowance, Tax Due, Employee and Employer National Insurance. This is a free version which does not guaranty update on time and may contain advertisement.

If you like this application, please do not hesitate to buy the paid version which is advert free and update will be available as soon as Tax rate/details has changed.