'gcprof is a simple utility for profile allocation and garbage collection activity in the JVM [...] Profile allocation and garbage collection activity in the JVM. The gcprof command runs a java command under profiling. Allocation and collection statistics are printed periodically. If -n or -no are provided, statistics are also reported in terms of the given application metric. Total allocation, allocation rate, and a survival histogram is given. The intended use for this tool is twofold: (1) monitor and test garbage allocation and GC behavior, and (2) inform GC tuning.'

as seen in their "Instagram Engineering" post

'Tcprstat is a free, open-source TCP analysis tool that watches network traffic and computes the delay between requests and responses. From this it derives response-time statistics and prints them out.' Computes percentiles, too

'When amount of sockets is enough large, netstat or even plain cat /proc/net/tcp/ cause nothing but pains and curses. In linux-2.4 the desease [sic] became worse: even if amount of sockets is small reading /proc/net/tcp/ is slow enough. This utility presents a new approach, which is supposed to scale well.' via scanlan

these are great - some new ones on me!

wraps strace(1) to summarise and aggregate I/O ops performed by a Linux process. looks pretty nifty (via Jeremy Zawodny)

hardware and software, specifically, and an Ubuntu/Thinkpad user. some good tips here, and well-written, naturally

log analyzer; removes common strings and patterns from log files, identifying outliers and hapaxen as "interesting". also does charting of frequencies etc.

hmm, nice-looking Scrum tool

wow, you can search a time period for everyone who bookmarked pages on a specific site (via Britta)

'your online JSON Formatter'. useful. via JKeyes

specifically, a port of dessid to the iPhone, recently causing headlines

now available. sadly, no support for Bugzilla, which is what we use in SpamAssassin (srsly), so I won't be trying it out just yet, but still -- cool

it really is. Yet another one-page intro to git, but a good one