# Allegro Common Lisp

> programming language with an integrated development environment (IDE)

**Wikidata**: [Q4033768](https://www.wikidata.org/wiki/Q4033768)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Allegro_Common_Lisp)  
**Source**: https://4ort.xyz/entity/allegro-common-lisp

## Summary  
Allegro Common Lisp (Allegro CL) is a dialect of the Lisp programming language developed by Franz Inc., featuring an integrated development environment (IDE). It supports object-oriented programming and dynamic typing, making it suitable for rapid prototyping and complex software systems. First released under the name ExCL in 1986, it was rebranded as Allegro CL in 1988.

## Key Facts  
- Officially renamed to **Allegro CL** in **1988**, previously known as **ExCL** (1986–1988).  
- Latest stable version is **10.1**, released on **April 25, 2017**.  
- Instance of: **programming language**, **object-based language**.  
- Typing discipline: **dynamic typing**.  
- Programming paradigm: **object-oriented programming**.  
- Website: [http://franz.com/products/allegro-common-lisp/](http://franz.com/products/allegro-common-lisp/)  
- Aliases: **Allegro CL**  
- Freebase ID: `/m/0cyxr2`  

## FAQs  
### Q: What is Allegro Common Lisp used for?  
A: Allegro Common Lisp is used for developing complex applications requiring symbolic computation, artificial intelligence, and rapid prototyping. Its IDE enhances productivity in large-scale software projects.

### Q: Who developed Allegro Common Lisp?  
A: Allegro Common Lisp was developed by **Franz Inc.**, a company specializing in Lisp-based technologies since the 1980s.

### Q: Is Allegro Common Lisp still maintained?  
A: Yes, the latest version, **10.1**, was released in April 2017, indicating ongoing support and maintenance by Franz Inc.

## Why It Matters  
Allegro Common Lisp plays a significant role in the Lisp ecosystem as one of the most mature and commercially supported implementations of Common Lisp. Designed for high-performance computing environments, it provides developers with tools for building robust, scalable applications. Its integration with an IDE makes it particularly valuable for enterprise-level development where debugging, profiling, and code management are critical. Over decades, it has been used in AI research, financial modeling, and telecommunications—sectors that demand both flexibility and computational power. As part of the broader Lisp family, Allegro CL contributes to preserving and advancing functional and object-oriented programming paradigms.

## Notable For  
- One of the earliest commercial implementations of **Common Lisp** with full ANSI compliance.  
- Integrated Development Environment (**IDE**) designed specifically for Lisp programming workflows.  
- Longevity in market—first released as **ExCL in 1986**, later becoming **Allegro CL in 1988**.  
- Support for **object-oriented programming** within a dynamically typed system.  
- Used across industries including finance, aerospace, and telecommunications due to performance and reliability.

## Body  

### History and Naming  
Allegro Common Lisp originated at **Franz Inc.**, initially named **ExCL** from **1986 to 1988**. In **1988**, it was officially rebranded as **Allegro CL**, which remains its current official name. The evolution reflects early efforts to establish a commercially viable implementation of Common Lisp during the rise of symbolic computing and AI development.

### Technical Overview  
Allegro CL is classified as both a **programming language** and an **object-based language**. It adheres to the **ANSI Common Lisp standard** while extending functionality through proprietary enhancements. Key features include:
- **Dynamic typing**: Variables do not require explicit type declarations.
- **Object-oriented programming support**: Built-in capabilities using CLOS (Common Lisp Object System).
- **Integrated Development Environment (IDE)**: Provides interactive debugging, inspection, and visualization tools tailored for Lisp development.

### Versions and Releases  
The platform continues to evolve under active development:
- Version **10.0** was released on **October 7, 2015**.
- Current preferred version is **10.1**, published on **April 25, 2017**.

These releases reflect improvements in compatibility, performance tuning, and developer tooling.

### Usage Context  
Allegro CL serves domains requiring symbolic processing, pattern matching, and dynamic behavior such as:
- Artificial Intelligence and expert systems
- Financial analytics platforms
- Telecommunications infrastructure
- Aerospace simulation systems

Its niche lies in supporting mission-critical applications where runtime adaptability and extensibility are essential.

## References

1. [Source](http://franz.com/about/press_room/acl10-10-6-2015.lhtml)
2. [Source](https://marjorie-wiki.de/wiki/Allegro_Common_Lisp)
3. [History of Franz Inc.](http://franz.com/about/company.history.lhtml)