| Horde Alarm Libraries | |
| Horde Authentication API | |
| Horde Autoloader | |
| Cache for the Horde_Autoloader library | |
| Horde Browser API | |
| Horde Command Line Interface API | |
| Fast Compression Library | |
| Horde Constraint library | |
| Horde Controller libraries | |
| Blowfish Encryption Library | |
| Horde CSS Parser | |
| Horde CSS Minify | |
| Horde library for WebDAV, CalDAV, CardDAV | |
| Horde Editor API | |
| Horde ElasticSearch client | |
| Horde Form API | |
| Horde Hash Table Interface | |
| Horde HTTP libraries | |
| IDNA backend normalization package | |
| IMSP API | |
| A package for handling Kolab data stored on an IMAP server | |
| Horde LDAP libraries | |
| Horde Logging library | |
| Horde Mail Library | |
| Horde Mail Autoconfiguration | |
| Horde Memcache API | |
| Horde MIME Library | |
| Horde Mongo Configuration | |
| Native Language Support (NLS) | |
| Horde Notification System | |
| Horde OAuth client/server | |
| Open-Xchange Connector | |
| Horde PDF Library | |
| Horde Queue | |
| PEAR installer role used to install Horde components | |
| Horde RPC API | |
| Scribe | |
| Secret Encryption API | |
| Client libraries for the Facebook REST API | |
| API accessor for gravatar.com | |
| Horde Socket Client | |
| Spellcheck API | |
| Horde Stream filters | |
| Preparation of Internationalized Strings ("stringprep") | |
| Horde support package | |
| Horde Template System | |
| Horde testing base classes | |
| Engine for performing and rendering text diffs | |
| Horde Text Filter API | |
| Horde API for flowed text as per RFC 3676 | |
| Thrift | |
| Horde Token API | |
| Horde Tree API | |
| Horde Url class | |
| Provides an API for encoding and decoding WBXML documents | |
| Tagging application | |
| An email filter rules manager | |
| A web based notes and memo manager | |
| Horde password changing application | |
| Wiki application |