Here’s a diagram showing all the Canadian tax software options, almost everything is made by a Canadian company except two of the most commonly used.
Please stop using turboTax and H&R Block, you’ll likely save quite a bit of money by switching to one of the Canadian owned options too. (H&R Block charges $49.98 for a typical couple, Studio Tax charges $17.50 for up to 10 returns). GenuTax is completely free to use.
Links to each of the Canadian options are available on ShopCanadianStuff.ca
The graphic is originally from ShopCanadianStuff.ca/blog
Be careful with where they store your data, they might be Canadian, but they might be storing your data in the USA and sharing it with USA companies. Read their terms.
I suggest using software that runs on your computer, like GenuTax, sadly it is windows only.
As far as I am aware, only a single online offer used to encrypt your data, but they removed it when they were bought by WealthSimple, so they could sell your data to third parties.