This app was mentioned in 9 comments, with an average of 2.44 upvotes
If you enjoy the task giving and tracking aspect but aren't able to see each other in person enough for the tracking of it I would suggest looking at the app Desire (https://play.google.com/store/apps/details?id=com.desireapps.desire). There is very little in the app specifically femdom but the entire app is about setting tasks for each other, deadlines, and rewards.
There's something called Desire. You basically give each other dare.
There's also mojoupgrade, which is less a of a game because it's a questionnaire, but hella fun if you do it together on separate laptops. It's kind of funky right now. Just don't use the E-Mail version, do it on one Computer. Shoutout to /u/brothel_sprout
We just started it, and it has a really fun interface and experience.
Desire - a game for couples
This is just like Desire
https://play.google.com/store/apps/details?id=com.desireapps.desire
I explored a few sites and asked questions. www.fetlife.com was good for info. Not so much good if you are looking for people - but there are tons of groups with good info. There are a few apps you can try too: http://mojoupgrade.com/ My partner and I did this one and loved it! Desire is another as well as Spice.
Maybe try Desire on Android. Can be a nice addition to LDRs and helps with lack of ideas.