Acronyms are organized according to the register in which they appear.

Java

JSTL
JSP Standard Tag Library

Information Technology (general)

ABI
Application Binary Interface
ACPI
Advanced Configuration and Power Interface
ARIA
Accessible Rich Internet Applications
CAPTCHA
Completely Automated Public Turing test to tell Computers and Humans Apart
CORS
Cross-Origin Resource Sharing
CSRF
Cross-Site Request Forgery (also spelled XSRF), pronounced "sea-surf". We defend against this attack using the Same Origin Securiy Policy (which may be relaxed using CORS)
DCE
Data Circuit-terminating Equipment or Data Communication Equipment
DTE
Data Terminal Equipment; e.g. a computer terminal
DHCP
Dynamic Host Configuration Protocol
FRU
Field Replaceable Unit
GPG
GNU Privacy Guard
MDI
Multiple Document Interface (see also SDI, TDI)
OTP
One Time Password
PBKDF2
Password-Based Key Derivation Function 2
RS-232
Recommended Standard 232; a standard introduced in 1960 for serial communication transmission of data. It formally defines the signals connecting between a DTE and a DCE. RS-232 typically uses a D-subminiature connector such as DE-9 (5-4 pin layout), DA-15 (8-7 pin layout) or DB-25 (13-12 pin layout)
SCM
Software Configuration Management or Source Code Management
SDI
Single Document Interface (see also MDI, TDI)
TAN
Transaction Authentication Number — used by some online banking services as a form of single use one-time passwords to authorize financial transactions.
TDI
Tabbed Document Interface (see also SDI, MDI)
UART
Universal Asynchronous Receiver-Transmitter; a computer hardware device for asynchronous serial communication
OOAD
Object Oriented Analysis and Design
YAGNI
You Aint Gonna Need It

generic

BATNA
Best Alternative To Negotiated Agreement
IRL
In Real Life
SOL
Simply Out of Luck (polite rendition)
TLC
Tender Loving Care: Obviously some systems might require bit of TLC after the reboot …

greek

ΔΣΤ-ΔΞΤ-ΠΑΓΤΠ
Δεν Συγχωρώ Τίποτα - Δεν Ξεχνάω Τίποτα - Περιμένω Αποζημίωση Για Τα Πάντα
ΕΑΗ-ΔΕ-ΑΣΠΕ
Έχω Απαντήσει Ήδη - Δεν Επαναλαμβάνομαι - Ανέτρεξε Σε Προηγούμενη Επικοινωνία μας
ΚΤΑΙΣΑΟΕΠΠ
Κατά Τα Άλλα, Ισχύουν Στο Ακέραιο Όσα Έχω Πει Προηγουμένως