are there any other useful tools out there that are compatible with A9LH?
They're mostly by d0k3, but your options regarding A9LH stuff, with brief explanations for those who may not know for some reason:
1. AuReiNand
2. CakesFW
3. ReiNand
4. Decrypt9 (NAND dumping/restoring, decrypting/encrypting, etc.)
5. EmuNAND9 (name is self-explanatory, but it deals with making emuNANDs and backing up/restoring them)
6. GodMod9 (used as a file explorer for SD, NAND, etc.)
7. Uncart (used to dump 3DS retail carts)
8. SafeA9LHInstaller (Aurora's tool for installing or updating A9LH)
9. OTPHelper (various utilities relating to the 2.1 downgrade and the OTP itself)
10. Dark Samus's A9LH updater
11. ARM9Select by FIX94 (simple boot manager like BootCTR, but it offers backlight init for A9LH forks that do screen init but keep the backlight off)
12. ARM9SelectHay by Hayleia (same as 11, but with different button configs)
13. BootCTR9 (same as its MenuHax counterpart)
14. CTRBootManager9 (same as its MenuHax counterpart)
Edit: Forgot some.