I have a recommendation for you that, In search of All Google FLOSS alternative I came to Know at Simplenote.com Which is a free and open-source alternative to Google Keep. I am Slightly depressed that it is not in your recommendation list. So please The Authenticity of this app and if possible Add it to your one of recommendation.
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@Torrey Hi Torrey, we listed Simplenote in the past but it was replaced with Standard Notes.
"As for Simplenote, as noted, it is not a privacy focused product and does not offer client-side encryption."
https://github.com/privacytoolsIO/privacytools.io/issues/221
@BurungHantu Thanks man for giving me your Precious time, As explained I will Shift to Standard notes ASAP. You guys are doing Great stuff.