The Apache .NET Antlib enables building and testing .NET applications using Apache Ant. It supports cross-platform development with tasks for NUnit, NAnt, MSBuild, and WiX, and adapts execution for Mono or Microsoft .NET environments.

Apache Accumulo is a distributed key/value store that provides scalable and secure data storage. It supports fine-grained access control, efficient data compression, and server-side processing, making it suitable for large-scale applications requiring high performance and flexible data management.

Apache ActiveMQ is an open-source, multi-protocol, Java-based message broker that enables asynchronous communication between applications. It supports various messaging protocols and client languages, making it suitable for scalable, distributed systems and enterprise integration patterns.

Apache AGE is a PostgreSQL extension that enables graph database functionality, allowing users to model and query data as nodes and edges while retaining full SQL capabilities. It supports hybrid queries using SQL and Cypher, making it ideal for analyzing complex relationships within relational databases.

Apache Airavata is a software framework for composing, managing, executing, and monitoring large-scale scientific applications and workflows on distributed computing resources such as clusters, supercomputers, grids, and clouds.

Apache Airflow is a workflow orchestration platform that enables users to programmatically author, schedule, and monitor data pipelines. It uses Python to define workflows as directed acyclic graphs and supports scalable, distributed execution across various environments.

Apache Allura is a web-based platform for managing software development projects. It supports source code repositories, issue tracking, wikis, blogs, and forums, enabling collaborative development and project management across multiple teams and tools in a unified environment.

Apache Ambari is an open-source management platform for provisioning, monitoring, and managing Apache Hadoop clusters. It provides a web-based UI and RESTful APIs to simplify cluster setup, service configuration, and health monitoring across distributed environments.

Apache Amoro is a lakehouse management system designed to unify batch and streaming data processing. It supports multiple table formats like Iceberg, Paimon, and Hive, and integrates with engines such as Flink and Spark. Amoro optimizes storage and query performance through self-managing features.

Apache Answer is an open-source Q&A platform designed for teams and communities to share knowledge. It supports forums, help centers, and internal knowledge bases, enabling users to ask questions, provide answers, and collaborate efficiently in a structured and searchable environment.