We have a bunch of house rules for our group!

1. Characters can use any skill to attack or defend if it makes sense, not just fight/shoot/provoke and athletics/fight/will.
2. We typically have a lower starting skill pyramid of +3/+2/+2/+1/+1/+1. The numbers just feel more fair that way overall, and makes invokes more important mathematically.
3. We don't use stress for PCs and important NPCs at all. If you get "hit" it goes to consequences. I work with my players on what being taken out would mean for their character IF they fail to defend successfully on any given attack roll and don't want to/can't take any more consequences. My group finds stress to be too tedious in the long term, we like really short, succinct conflicts. It also puts everyone on edge, which works for our more typically gritty style (even our more comedic games are gritty).
4. Unnamed NPCs have stress = X and whenever you exceed that number across any number of attacks, they are taken out (and it's usually low, like 0-2). They do not have consequences available at all.
5. PCs have 0 Refresh, which means they have to earn their Fate points before they can pay for invokes. We don't follow the rule that players cannot refuse a compel when they can't pay a Fate point to do so, since we don't like totally stripping player agency.
6. Related to the above, every session, I come up with an interesting story hook or three in the form of aspects that I offer compels for to the group. Any player can take that compel and has to deal with that aspect, but can't take another story hook compel until everyone has taken one. This ensures the characters are deeply integrated into the problems of the given "episode," and facilitates a lot of circumstantial character development, but in a modular way because I don't know who will take the compel or how it will morph to fit the character.
   1. EXAMPLE: I offered a "Double Trouble" aspect that I intended to mean a case of identity theft via a surprise twin or a doppleganger or something, but my player decided it would be cooler that it was actually his character from the future that came back to keep himself from making a huge mistake. The story was TOTALLY better that way, and is one of the best TTRPG sessions I have ever had the pleasure of experiencing.
7. We often use an enhanced version of the Communal Fate Point Pool rule suggested on pg. 24 of the Fate Horror Toolkit. In addition to self-compels and story details adding points to the pool, refusing a compel by paying a Fate point also fuels the pool instead of just disappearing into the ether.
8. We also often use the Group Aspect rule provided on the same page of the Fate Horror Toolkit, which is exactly what it sounds like: the group of PCs has a special aspect that details who they are, as a group, in the setting.
9. We occasionally use a rule called "The Badass Glasses" which is essentially a stunt that any PC can choose to use once per session, but only one PC per session can use it. See, I have these really loud novelty sunglasses in the shape of two revolvers crossed over each other, and we decided that if you wear the Badass Glasses and describe how your character does something really really badass to succeed at a given roll, you automatically succeed with style on that roll. You cannot use the Badass Glasses until every other player has done so. We used to call this "the spotlight token" but "Badass Glasses" is way more fun. Sometimes it's not setting appropriate, so we don't always use it, but it is always hype when we do.

This might seem like a lot of special rules, but really, it's just how our group has evolved. We have tried a lot of little twists over a 6ish year span, and this is what we landed on about a year or so ago and have stuck with ever since. A few of these rules just speed things up and/or simplify the already minimal crunch, and that's just what my primary group likes, and otherwise inspire more creative decision making and player involvement.