| compiler 7.2.5 | A byte code compiler for Erlang which produces highly compact code | 
| erts 10.1 | Functionality necessary to run the Erlang System itself | 
| kernel 6.1 | Functionality necessary to run the Erlang System itself | 
| sasl 3.2.1 | The System Architecture Support Libraries is a set of tools for release upgrades and alarm handling etc. | 
| stdlib 3.6 | The Erlang standard libraries | 
| mnesia 4.15.5 | A heavy duty real-time distributed database | 
| odbc 2.12.2 | An interface to relational SQL-databases built on ODBC (Open Database Connectivity). | 
| os_mon 2.4.6 | A monitor which allows inspection of the underlying operating system | 
| otp_mibs 1.2.1 | SNMP management information base for Erlang/OTP nodes. | 
| snmp 5.2.12 | Simple Network Management Protocol (SNMP) support including a MIB compiler and tools for creating SNMP agents | 
| asn1 5.0.7 | Provides support for Abstract Syntax Notation One | 
| crypto 4.3.3 | Cryptographical support | 
| diameter 2.1.6 | Diameter | 
| eldap 1.2.5 | eldap - Erlang LDAP library | 
| erl_interface 3.10.4 | Low level interface to C | 
| ftp 1.0.1 | FTP client | 
| inets 7.0.2 | A set of services such as a Web server and a ftp client etc. | 
| jinterface 1.9.1 | Low level interface to Java | 
| megaco 3.18.4 | Megaco/H.248 is a protocol for control of elements in a physically decomposed multimedia gateway, enabling separation of call control from media conversion. | 
| public_key 1.6.2 | API to public key infrastructure. | 
| ssh 4.7.1 | Secure Shell application with sftp and ssh support | 
| ssl 9.0.2 | ssl- Secure Socket Layer. | 
| tftp 1.0.1 | TFTP application | 
| wx 1.8.5 | A Graphics System used to write platform independent user interfaces | 
| xmerl 1.3.18 | Provides support for XML 1.0 | 
| debugger 4.2.6 | A debugger for debugging and testing of Erlang programs | 
| dialyzer 3.3.1 | The DIALYZER, a DIscrepancy AnaLYZer for ERlang programs. | 
| et 1.6.3 | Event Tracer (ET), uses the built-in trace mechanism in Erlang and provides tools for collection and graphical viewing of trace data. | 
| observer 2.8.1 | Observer, tools for tracing and investigation of distributed systems | 
| parsetools 2.1.8 | A set of parsing and lexical analysis tools | 
| reltool 0.7.7 | Reltool is a release management tool. It analyses a given Erlang/OTP installation and determines various dependencies between applications. The graphical frontend depicts the dependencies and enables interactive customization of a target system. The backend provides a batch interface for generation of customized target systems. | 
| runtime_tools 1.13.1 | Runtime tools, tools to include in a production system | 
| syntax_tools 2.1.6 | A utility used to handle abstract Erlang syntax trees, reading source files differently, pretty-printing syntax trees. | 
| tools 3.0.1 | A set of programming tools including a coverage analyzer etc | 
| common_test 1.16.1 | A portable framework for automatic testing | 
| eunit 2.3.7 | Support for unit testing. | 
| edoc 0.9.4 | A utility used to generate documentation out of tags in source files. | 
| erl_docgen 0.8.1 | A utility used to produce the OTP documentation. | 
| hipe 3.18.1 | High Performance Erlang |