Simpy

Simpy was a web-based personal and social bookmarking service.

The service launched in May 2004. In 2010, it was acquired by Reuters and ceased operation as a social bookmarking site in April of that year.

Service features

Simpy used tags and tag clouds to aid bookmark recall and allows bookmarks to be shared or kept private. In addition to saving, tagging, and sharing links, users could also save, tag, and search free-text notes. Most data pages also had RSS feeds. Simpy's founder is one of the developers of Lucene, a popular text search toolkit, thus Simpy had powerful search capabilities.

The service allowed for cooperation, via groups with different levels of privacy, and for discovery of relevant and new links via its watchlists and watchlist filters.

Simpy had a well-documented REST API suitable for mashups and integration with other applications and services.

de.lirio.us user migration to Simpy

de.lirio.us was an open source clone of del.icio.us (criticized for its direct copying). It had technical problems and in March 2006, its maintainer announced that Simpy would take over the de.lirio.us userbase. The transfer to Simpy was completed in July 2006.

SimPy

SimPy is a process-based discrete-event simulation framework based on standard Python. Its event dispatcher is based on Python’s generators and can also be used for asynchronous networking or to implement multi-agent systems (with both, simulated and real communication).

Processes in SimPy are simple Python generator functions and are used to model active components like customers, vehicles or agents. SimPy also provides various types of shared resources to model limited capacity congestion points (like servers, checkout counters and tunnels). From version 3.1, it will also provide monitoring capabilities to aid in gathering statistics about resources and processes.

Simulations can be performed “as fast as possible”, in real time (wall clock time) or by manually stepping through the events.

Though it is theoretically possible to do continuous simulations with SimPy, it has no features that help you with that. On the other hand, SimPy is overkill for simulations with a fixed step size where your processes don’t interact with each other or with shared resources — use a simple while loop in this case.