ANNOVAR: functional annotation of genetic variants from high-throughput sequencing data. 基因组变异数据的功能注释，人重必用
KEGG：a database resource for understanding high-level functions and utilities of the biological system, such as the cell, the organism and the ecosystem, from molecular-level information, especially large-scale molecular datasets generated by genome sequencing and other high-throughput experimental technologies.
EggNOG：(evolutionary genealogy of genes: Non-supervised Orthologous Groups), a public resource that provides Orthologous Groups (OGs) of proteins at different taxonomic levels, each with integrated and summarized functional annotations.（分析蛋白的直系同源组，同时作功能注释，在肠道微生物分析时会用到）
Meta&16S
greengenes：a Chimera-Checked 16S rRNA Gene Database and Workbench Compatible with ARB
Silva：A comprehensive on-line resource for quality checked and aligned ribosomal RNA sequence data.
HPMCD：the database of human microbial communities from metagenomic datasets and microbial reference genomes (Paper) 人类泛微生物群体
GeneCards：人类基因的综合数据库，提供简明的基因组，蛋白质组，转录，遗传和功能上所有已知和预测的人类基因。GeneCards中的信息功能信息包括指向疾病的关系，突变和多态性，基因表达，基因功能，途径，蛋白质与蛋白质相互作用，相关的药物及化合物和切割等先进的研究抗体的试剂和工具等，重组蛋白，克隆，表达分析和RNAi试剂等。 （各种ID相互转换）
持续整理~