Haven’t moved off Windows yet. My biggest desire would be porting Quicken to Linux, or working with software very similar to it.
I need both accounting for home and business functionality, and don’t want to use a web tool to do it.
Both KMyMoney and GnuCash can be used on Windows, so you can try them out. Or you could try to run Quicken in Linux in the WINE emulator.
The Linux version of excel works pretty well. Some differences, though that require getting used to.
And it will read MS excel files and save them.
You might check out Money Manager EX. I have been using it about 10 years, after Quicken became too bloated.
MMEX allows multiple accounts, etc. It doesn’t have all the bells and whistles of the bigger programs, but is good for basic money management and multiple bank/savings accounts, etc.
And it is donationware.
http://www.moneymanagerex.org/news
It has a Linux version, and IIRC, it will import regular Quicken files.
Check it out.