Is it permissible to sell computer programs although I am afraid that they will use them for sinful purposes and that I may incur a burden of sin as a result of that, or am I not responsible for what the purchaser does after he has bought it from me?

If a man was praying the sunnah of the fajr [prayer], or other than it, and whilst doing so the [iqaamah for the obligatory] prayer was called, is he required to [promptly] terminate his prayer in order to join the imaam [and congregation] in [the obligatory] prayer, or should he complete his prayer [first]?

I wasnt aware that ramadan fasts missed due to menstruation had to be made up before nafl ones and I started keeping some nafl ones so is it possible for me to change the intention of the previous nafl ones I have kept or to change the intention of fast during the day? Because the one I kept today for example I started off with the intention of keeping a nafl fast but can I now change this to the intention of making up the ones I missed in ramadan?

Is it permissible to make phone apps to sell Islamic information? For example, the iPhone mobile phone has a number of apps that are sold via the Apple company, such as the electronic Mushaf, Saheeh al-Bukhaari, Saheeh Muslim, and so on. I would like to make apps like these, that deal with the Qur’an and Prophet’s hadeeths, for the iPhone and iPad, and upload them to the App Store as unique apps.

In our country we have been affected by war and we were expelled from our land 23 years ago. Praise be to Allah, my father and I are settled now and we have a business. We borrowed money in order to settle and start a business, the value of which was 1 million. When we worked out the value of zakaah that we owe on the property and trade goods that we have in our possession, it was estimated to be 7 million, and the trade goods on which zakaah is due are worth 5 or 6 million. 
My questions are: 
1. Are we required to pay zakaah, as we have not paid it all these years because we were not able to pay off the debt of 1 million? Was it correct for us not to pay zakaah?
2. We do not have any cash now, if we are required to pay zakaah. We helped a brother of ours to pay off a debt he owed, so that he could pay off the borrowed amount without paying the interest that had been agreed upon. Is it possible for us to waive this debt and thus pay off the zakaah that we owe?
3. We own some property in the country where the war was, that we took possession of after the war ended, and we are planning to sell this property in order to pay off debts and so that we can buy a house in the place where we live now. Is this property subject to zakaah?.

I am currently living in Canada for the purpose of study, but my permanent place of residence is between Jeddah and Amman. When I stayed in Amman during the summer break, I decided to go to Jeddah to deal with some official papers, and I intended to do ‘umrah if Allah made that possible for me and if I had a mahram and enough time to do ‘umrah. I intended to do ‘umrah from Jeddah because my mahram would be there. But because I was not certain that I would be able to do ‘umrah, on the day I travelled by plane I did not do ghusl, because I was menstruating and I had not yet decided to do ‘umrah. When I got there on the second day I did ghusl and formed the intention to do ‘umrah from Jeddah, and I did it.
My questions are:
Is my ihram from the miqaat of Jeddah considered valid or not?  Because of my family circumstances, we are always moving back and forth between Jeddah and Amman, and we always enter ihram from our house in Jeddah, even if we are on our way back from a trip to Amman and after staying in Jeddah for several days. We do not remember how many times we have done ‘umrah in this manner.
What is required of us if we should have entered ihram from the miqaat for the people of ash-Shaam (Greater Syria)? After I did ‘umrah I was uncertain as to whether I was completely clean following my period. If I think it most likely that I was still menstruating whilst I was doing ‘umrah, what is the ruling on my ‘umrah and what expiation do I have to offer?.

My question is regarding distributing leaflets/pamphlets for dawah purposes that contain Quranic verses. It is likely that many of them will end up on the streets or bins after being distributed. Isnt this wrong and should this discourage us giving out such material? Also, is this ok, considering that the targeted recipients are non-muslims who are impure?

How does one do ghusl (full ablution) to cleans oneself of janaabah (impurity following sexual activity)?

Salam Alaykum shaykh. I have a friend who have accepted Islam not long ago. He asks if it is allowed for him that his father who is not a Muslim, buys a house With a loan based on ribaa (usury/interest). And then my friend will buy the house from his father by monthly installment, without ribaa (usury/interest)?

I am a young Algerian man married to a foreign Christian woman who has an inclination towards Islam. But Allah has willed that we should separate. My question is: is the kitaabi (Jewish or Christian) woman required to observe ‘iddah and do I have to impose it on her if she refuses to observe ‘iddah? There is a second problem, which is that I am living in her house and I do not have any other accommodation to go to. What is the Islamic ruling concerning that?.

Is it permissible to eat food that is distributed on the birthday of the Prophet Muhammad (peace and blessings of Allaah be upon him)? Some people quote as evidence the idea that because Abu Lahb set free a slave woman on the birthday of the Prophet (peace and blessings of Allaah be upon him), Allaah reduced the torment for him on that day.

We are three sons, three daughters and a mother. We inherited 14,500 Jordanian dinars from our father and we invested this money in some business; every month we get 215 Jordanian dinars. Is any zakaah due on this amount, because this money belongs to everyone?.