- 1C_Enterprise
- 2-Dimensional_Array
- 4D
- ABAP
- ABAP_CDS
- ABNF
- AGS_Script
- AIDL
- AL
- AMPL
- ANTLR
- API_Blueprint
- APL
- ASL
- ASN.1
- ASP.NET
- ATS
- ActionScript
- Ada
- Adobe_Font_Metrics
- Agda
- Alloy
- Alpine_Abuild
- Altium_Designer
- AngelScript
- Ant_Build_System
- Antlers
- ApacheConf
- Apex
- Apollo_Guidance_Computer
- AppleScript
- Arc
- AsciiDoc
- AspectJ
- Assembly
- Astro
- Asymptote
- Augeas
- AutoHotkey
- AutoIt
- Avro_IDL
- Awk
- BASIC
- Ballerina
- Batchfile
- Beef
- Befunge
- Berry
- BibTeX
- Bicep